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Professor of Medicine and Public Health

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Presentation on theme: "Professor of Medicine and Public Health"— Presentation transcript:

1 Professor of Medicine and Public Health
Aging and HIV Amy C. Justice, MD, PhD Professor of Medicine and Public Health Yale University

2 Aging with HIV Background HIV+ ART Virus suppressed but present
This “aging” of the HIV epidemic is mainly due to three factors: the success of antiretroviral therapy in prolonging the lives of people living with HIV; decreasing HIV incidence among younger adults shifting the disease burden to older ages; and the often-unmeasured, and thus often overlooked, fact that people aged 50 years and older exhibit many of the risk behaviours also found among younger people. UNAIDS. HIV and Aging. Available at: Accessed 09/16/16 Virus suppressed but present Immune dysfunction Long-term ART toxicity Aging with multimorbidity HIV = human immunodeficiency virus; ART = antiretroviral therapy.

3 Living with HIV in US by Age Extrapolated from 2014 CDC Data

4 Percentage of Adults Living with HIV Aged 50+ By Year and Region
Western and Central Europe and North America Eastern Europe and Central Asia Latin America Caribbean Sub-Saharan Africa Asia and the Pacific Middle East and North Africa 1995 2012 Percentage (%) 35 30 25 20 15 10 5 Western and Central Europe and North America 33%; Eastern Europe and Central Asia 17%; Latin America 15%; Caribbean 13%; Sub-Saharan Africa 9%; Asia and the Pacific 8%; Middle East and North Africa 6% United Nations Programme on HIV/AIDS (UNAIDS). HIV and Aging. Accessed 9/22/16.

5 HIV+ Incident Age in VACS
Percent Age in Years at Entry

6 Probability of Survival (%)
10-year Decreased Life Expectancy in Older HIV+ Adults in Modern ART Era HIV- Controls 1996–2014 Probability of Survival (%) HIV+ 2006–2014 2000–2005 1996–2000 Age (years) Legarth RA, et al. J Acquir Immune Defic Syndr. 2016;71(2):

7 Many Age-Associated Morbidities Increased, Not Accelerated, in Treated HIV
Cardiovascular disease Liver disease Cancer (non-AIDS) Kidney disease Bone fractures and osteoporosis Cognitive decline Non-AIDS infections COPD AIDS = acquired immune deficiency syndrome; COPD = chronic obstructive pulmonary disease. Freiberg M, et al. JAMA Int Med. 2013;173(8): ; Tseng Z, et al. J Am Coll Cardiol. 2012;59(21): ; Grinspoon SK, et al. Circulation. 2008;118(2): ; Silverberg M, et al. AIDS. 2009;23(17): ; Triant V, et al. J Clin Endocrinol Metab. 2008;93(9): ; Arnsten JH, et al. AIDS. 2007;21(5): ; Odden MC, et al. Arch Intern Med. 2007;167(20): ; Choi A, et al. AIDS. 2009;23(16): ; McCutchan JA, et al. AIDS. 2007;21(9): ; Sogaard OS, et al. Clin Infect Dis. 2008;47(10): ; Desquilbet L, et al. J Gerontol A Biol Sci Med Sci. 2007;62(11): ; Attia EF, et al. Chest. 2014;145(6):

8 Why is HIV-1 RNA suppression not enough?
How can we follow our patient’s disease progression? What can we do to improve outcomes now and in the future? RNA = ribonucleic acid. The Graying of AIDS. Accessed 9/22/16.

9 Why isn’t HIV-1 RNA suppression enough?

10 Does HIV Exacerbate Aging? An Important Clue from Nature
Sooty Mangabey Infect with SIV High levels of viral replication No AIDS, normal lifespan Minimal immune activation Rhesus Macaque Infect with SIV High levels of viral replication AIDS and death Massive immune activation SIV = simian immunodeficiency virus. Silvestri G, et al. Immunity. 2003;18(3):

11 ↓Tight Junctions (Epple, Gut, 2009)
Microbial Translocation (“Leaky Gut”) as a Cause of Immune Activation in HIV Disrupted Gut Epithelial Barrier ↑EC Apoptosis (Li, JID, 2008) ↓Tight Junctions (Epple, Gut, 2009) Loss of Mucosal Immunity ↓CD4+ T cells ↓Th17 cells (Veazey, Science, 1998; Brenchley, J Exp Med, 2004; Guadalupe, J Virol, 2003; Mehandru, J Exp Med, 2004) Brenchley JM, et al. Nat Med. 2006;12(12):

12 We lack interventions that block HIV expression
HIV Reservoirs Established in First Week of Infection and Continue to Release Virus on ART Mostly reflects release of virus from infected cells without productive replication We lack interventions that block HIV expression 107 106 105 104 103 102 101 100 10-1 HIV-1 RNA (copies/mL) Time (days) Maldarelli F, et al. PLoS Pathog. 2007;3(4):e46.

13 T-cell Activation Remains Abnormally High During ART-Mediated Viral Suppression
60 50 40 30 20 10 HIV- ART+ VL < 75 ART- VL > 10K % CD38+ HLA-DR+ CD8+ T cells P < 0.001 Hunt PW, et al. J Infect Dis. 2003;187(10): ; Hunt PW, et al. PLoS One. 2011;6(1):e15924.

14 Inflammation and Immune Activation Pre- and Post-ART (MACS 1984–2009)
164% (138%, 192%) HAART-naïve relative to HIV- HIV suppressed relative to HIV- HIV suppressed relative to HAART-naïve 100 80 60 40 20 -20 -40 -60 Percent Difference (%) CXCL10 sCD27 IL-10 sIL-2Ra sTNFR2 IFN-V CXCL-13 TNF-a IL-12p70 sIL-6R BAFF CCL2 IL-6 sCD14 GM-CSF CCL11 CRP IL-1B sGP130 IL-8 CCL13 CCL17 CCL4 Generalized gamma models adjusted for age, race, smoking, HCV, obesity, diabetes, and site Median ages (years): 42 uninfected, 38 ART-naïve, and 48 suppressed 13 biomarkers “normalized” in 1 year, 12 remained distinct from uninfected After 1 year, values stabilized Wada NI, et al. AIDS. 2015;29(4):

15 Inflammation Predicts Disease in Treated HIV Infection
Mortality (Kuller, 2008; Tien, 2010; Justice, 2012; Hunt, 2014) Cardiovascular Disease (Duprez, 2009) Cancer (Breen, 2010; Borges, 2013) Venous Thromboembolism (Musselwhite, 2011) Type II Diabetes Mellitus (Brown, 2010) COPD (Attia, 2014) Renal Disease (Gupta, 2015) Bacterial Pneumonia (Bjerk, 2013) Cognitive Dysfunction (Burdo, 2013; Letendre, 2012) Depression (Martinez, 2014) Frailty (Erlandson, 2013) Kuller LH, et al. PLoS Med. 2008;5(10):e203; Tien PC, et al. J Acquir Immune Defic Syndr. 2010;55(3): ; Justice AC, et al. Clin Infect Dis. 2012;54(7): ; Hunt PW, et al. J Infect Dis. 2014;210(8): ; Duprez DA, et al. Atherosclerosis. 2009;207(2): ; Breen EC, et al. Cancer Ep Bio Prev. 2010; Borges AH, et al. AIDS. 2013;27(9): ; Musselwhite LW, et al. AIDS. 2011;25(6): ; Brown TT, et al. Diabetes Care. 2010;33(10): ; Attia EF, et al. Chest. 2014;146(6): ; Gupta SK, et al. HIV Med. 2015;16(10): ; Bjerk SM, et al. PLoS One. 2013;8(2):e56249; Burdo TH, et al. AIDS. 2013;27(9): ; Letendre SL, et al. CROI. 2012; Abstract 82; Martinez P, et al. J Acquir Immune Defic Syndr. 2014;65(1):42-49; Erlandson KM, et al. J Infect Dis. 2013;208(2):

16 How can we monitor disease among those on ART?

17 Many Interacting Factors Play A Role
AGING HIV Viral Hepatitis Substance Use Immune Dysfunction + Senescene Microbial Translocation “Leaky Gut” Chronic Inflammation and Platelet Hypercoagulability HIV + Non HIV Treatment Toxicity Oxidative Stress Associated Comorbid Disease Incremental Depletion in Organ System Reserve Functional Decline Organ System Failure Repeated Hospitalization / Nursing Home Placement Death Presenting conditions VACS Risk Index Overlapping + Interacting Pathophysiologic Processes Preclinical + Clinical Organ System Injury Advanced Clinical Disease Health Care Outcomes

18 VACS Index Components Age HIV Specific Biomarkers
Score Age (years) < 50 50–64 12 ≥ 65 27 CD4 ≥ 500 cells/mm3 350–499 6 200–349 100–199 10 50–99 28 29 HIV-1 RNA < 500 copies/mL 500 to 1 x 105 7 ≥ 1 x 105 14 Hemoglobin ≥ 14 g/dL 12–13.9 10–11.9 22 < 10 38 FIB-4 < 1.45 1.45–3.25 > 3.25 25 eGFR mL/min ≥ 60 45–59.9 30–44.9 8 < 30 26 Hepatitis C Infection 5 Age HIV Specific Biomarkers Biomarkers of General Organ System Injury

19 Biomarkers of Inflammation Correlated with VACS Index (overall and components)
Justice AC, et al. Clin Infect Dis. 2012;54(7):

20 VACS Index is Accurate in Important Subgroups
100 80 60 40 20 VACS Index Score 5-year mortality (%) NA-ACCORD (N=10,835) 100 80 60 40 20 VACS Index Score 5-year mortality (%) VACS (N=5,066) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Age < 50 years (N = 11,191) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Age > 50 years (N = 4,710) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Men (N=12,785) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Women (N=3,116) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Black (N = 5,878) 100 80 60 40 20 VACS Index Score 5-year mortality (%) White (N = 6,079) 100 80 60 40 20 VACS Index Score 5-year mortality (%) Undetectable VL (N = 8,715) Detectable VL (N = 7,186) 100 80 60 40 20 VACS Index Score 5-year mortality (%) NA-ACCORD = North American AIDS Cohort Collaboration on Research and Design. Justice AC, et al. J Acquir Immune Defic Syndr. 2013;62(2):

21 VACS Index Reflects Frailty Indicated By:
Functional Performance (Erlandson, 2012) Sarcopenia (Oursler, 2013) Neurocognitive Performance (Marquine, 2014) Autonomic Neuropathy (Robinson-Papp, 2013) Fragility Fractures (Womack, 2013; Yin, 2016) Hospitalizations and ICU Admissions (Akgun, 2013) ICU = intensive care unit. Erlandson KM, et al. HIV Clin Trials. 2012;13(6): ; Oursler KK, et al. AIDS Res Hum Retroviruses. 2013;29(9): ; Marquine MJ, et al. J Acquir Immune Defic Syndr. 2014;65(2): ; Robinson-Papp J, et al. Patient Care STDS. 2013;27(10): ; Womack JA, et al. Clin Infect Dis. 2013;56(10): ; Yin MT, et al. J Acquir Immune Defic Syndr. 2016;72(5): ; Akgun KM, et al. J Acquir Immune Defic Syndr. 2013;62(1):52-59.

22 Time-Updated VACS Index for Predicting Acute Myocardial Infection
*lowest AIC (best model fit) HIV Viral Load (copies/mL) CD4 (cells/mm3) VACS Index Score Baseline Time- updated Cumulative time-updated Referent Category <100,000 <100,000+ ≤200 1,000-9,999 1,000+ <1,000 ≥200 <200 1,000-14,999 15,000-99,999 100,000+ ≥500 <815 815-1,499 1, ≥2,700 <50 50+ <20 20-34 35-54 85-149 265+ <85 55+ HR Time-updated VACS Index provided better AMI prediction than CD4 count and HIV-1 RNA suggesting that current health determines risk more than prior history and that risk assessment can be improved by biomarkers of organ injury Crude and adjusted hazard ratios and 95% CI are presented on a log2scale, grey diamonds denotes crude measures, black squares denote adjusted measures. Adjusting factors: all models age, diabetes, cholesterol low- and high-density lipoprotein, smoking, hypertension; HIV viral load models additionally adjusted for CD4; CD4 models additionally adjusted for HIV viral load. AMI = acute myocardial infection. Salinas JL, et al. Clin Infect Dis. 2016; Epub ahead of print.

23 Time-Updated VACS Index
for Predicting All-Cause Mortality Referent Category Time-updated VACS Index provided better mortality prediction than CD4 count and HIV-1 RNA suggesting that current health determines risk more than prior history and that risk assessment can be improved by biomarkers of organ injury Baseline <100,000 <100,000+ *lowest AIC (best model fit) Time- updated HIV Viral Load (copies/mL) ≤200 1,000-9,999 1,000+ 1,000-14,999 Cumulative time-updated <1,000 15,000-99,999 100,000+ Baseline ≥200 <200 <200 Time- updated CD4 (cells/mm3) ≥500 <815 Cumulative time-updated ≥2,700 815-1,499 1, Crude and adjusted hazard ratios and 95% CI are presented on a log2scale, grey diamonds denotes crude measures, black squares denote adjusted measures. Adjusting factors: all models age, diabetes, cholesterol low- and high-density lipoprotein, smoking, hypertension; HIV viral load models additionally adjusted for CD4; CD4 models additionally adjusted for HIV viral load. Baseline <50 50+ 20-34 Time- updated <20 35-54 VACS Index Score 55+ 85-149 Cumulative time-updated <85 265+ HR Salinas JL, et al. Clin Infect Dis. 2016; Epub ahead of print.

24 VACS Index is Responsive to
Differs by level of Alcohol use Adherence to ART Substance use Treatment with ART DAAs for HCV

25 What can we do now? Four steps to take now to minimize frailty and maximize quality of life.

26 1. Diagnose and Treat As Early As Possible

27 Delayed Treatment by Age
*Among individuals in NA-ACCORD. Althoff KN, et al. AIDS Res Ther. 2010;7:45.

28 HIV-1 RNA Suppression and Cancer
Park LS, et al International Conference on Malignancies in AIDS and Other Acquired Immunodeficiencies [Oral Presentation].

29 2. Treat HCV (and HBV) Infection

30 HCV Infection Harms More Than the Liver
Hematologic and Autoimmune Diseases Mixed Cryoglobulinemia B-cell Lymphoma Liver Autoimmune Thyroiditis Inflammation Steatosis Fibrosis/Cirrhosis Hepatocellular Carcinoma Cholangiocarcinoma Membrano-Proliferative Glomerulonephritis Sicca Syndrome HCV CVD/Metabolic Disease Atherosclerosis Insulin Resistance/Diabetes Myocardial Dysfunction Neurocognitive Diseases Cognitive Impairment HCV = hepatitis C virus; CVD = cardiovascular disease. Negro F, et al. J Hepatol. 2014;61(1 Suppl):S69-S78. Fibromyalgia

31 3. Minimize Polypharmacy

32 Polypharmacy Typically defined as > 5 chronic drugs
Associated with diminished marginal benefit from additional medication due to: Nonadherence Drug-drug interactions Cumulative toxicity Risk of adverse events increases approximately 10% with each additional medication Interacts with alcohol, tobacco, or other substances Salazar JA. Expert Opin Drug Saf. 2007;6(6): ; Gandhi TK. N Engl J Med. 2003;348(16):

33 Chronic Medication Count by Age and HIV Status (VACS)
Edelman EJ, et al. Drugs Aging. 2013;30(8):

34 Prescribed Substances Opioids and Benzodiazepines
Co-prescribing particularly problematic Long-term (> 90 days) requires careful intervention Partner with addiction specialists Motivational interviewing and cognitive behavioral therapy May require medication: Most commonly buprenorphine

35 Tobacco, Opioids, and Benzodiazepines
Variable Overall (N = 64,441) Uninfected (n = 47,452) HIV-infected (n = 16,989) HR (95% CI) P Value Long-term opioid receipt 1.39 (1.21, 1.60) < 0.001 1.35 (1.14, 1.61) 0.0006 1.54 (1.21, 1.96) 0.001 Long-term benzodiazepine receipt 1.33 (1.10, 1.62) 0.004 1.41 (1.12, 1.78) 0.003 1.16 (0.80, 1.68) 0.45 Long-term opioid and benzodiazepine receipt 1.51 (1.22, 1.87) 0.0001 1.43 (1.10, 1.86) 0.008 1.82 (1.27, 2.62) Long-term medication count 1.05 (1.04, 1.07) 1.04 (1.03, 1.06) 1.05 (1.02, 1.08) 0.0002 Alcohol use disorder 1.63 (1.39, 1.90) 1.56 (1.30, 1.88) 1.53 (1.17, 2.02) 0.002 Drug use disorder 0.95 (0.81, 1.13) 0.59 0.88 (0.70, 1.11) 0.28 1.16 (0.89, 1.51) 0.27 Schizophrenia 1.14 (0.92, 1.40) 0.23 1.09 (0.86, 1.38) 0.49 1.45 (0.94, 2.25) 0.09 Bipolar 0.92 (0.74, 1.14) 0.44 0.93 (0.71, 1.22) 0.60 1.03 (0.72, 1.47) 0.88 Major depression 0.95 (0.79, 1.15) 0.62 1.07 (0.84, 1.35) 0.86 (0.63, 1.17) 0.33 PTSD 0.79 (0.68, 0.93) 0.75 (0.63, 0.91) 0.88 (0.64, 1.20) 0.41 Acute pain 1.72 (1.43, 2.08) 1.76 (1.39, 2.23) 1.70 (1.26, 2.31) Chronic pain 0.93 (0.83, 1.05) 0.24 0.93 (0.81, 1.07) 0.29 0.95 (0.78, 1.17) 0.64 Black vs white 0.86 (0.77, 0.96) 0.006 0.81 (0.70, 0.92) 0.90 (0.74, 1.09) Hispanic vs white 0.58 (0.45, 0.73) 0.56 (0.42, 0.75) 0.57 (0.38, 0.87) 0.009 Other vs white 0.87 (0.63, 1.18) 0.37 0.88 (0.60, 1.29) 0.51 0.81 (0.47, 1.40) 0.46 VACS Index score 1.12 (1.11, 1.13) 1.23 (1.21, 1.25) 1.08 (1.06, 1.10) Current smoking vs never 1.87 (1.62, 2.15) 2.01 (1.69, 2.39) 1.80 (1.41, 2.30) Past smoking vs never 1.43 (1.21, 1.70) 1.37 (1.11, 1.68) 1.43 (1.04, 1.96) 0.03 PTSD = post-traumatic stress disorder. Weisberg DF, et al. J Acquir Immune Defic Syndr. 2015;69(2):

36 Polypharmacy and Substance Use
Complete Medication Reconciliation Perform annually and update with medication changes Assess medications taken, adherence, and related symptoms Include assessment of over-the-counter medications and supplements Assess for Tobacco, Alcohol, and Substance Use Use standardized instruments Assess and Rank Each Medication According to Risks and Benefits Prioritize ART and pharmacotherapy for alcohol/substance use disorders Use risk index, such as VACS index, to assess mortality Prioritize and Plan with Patient Incorporate goals and criteria for stopping treatment Develop strategies to monitor for medication-induced symptoms and other adverse events Incorporate patient preferences Edelman EJ, et al. Drugs Aging. 2013;30(8):

37 4. Council a Healthy Lifestyle

38 Lifestyle Contributes to Immune Activation in Treated HIV
Smoking increases monocyte activation (Valiathan, 2014) Hazardous EtOH associated with ↑ sCD14 / microbial translocation (Carrico, 2015) Methamphetamine use increases immune activation and suppresses T-cell function (Massanella, 2015) Obesity associated with increased inflammation (Koethe, 2013) Moderate exercise decreases inflammation in pilot trials (Longo, 2014) EtOH = ethyl alcohol; sCD14 = soluble CD14. Valiathan R, et al. PloS One. 2014;9(5):e97698; Carrico AW, et al. Alcohol Clin Exp Res. 2015;39(12): ; Massanella M, et al. Sci Rep. 2015;5:13179; Koethe JR, et al. AIDS Res Hum Retroviruses. 2013;29(7): ; Longo V, et al. CROI. 2014; Abstract 763.

39 Weight Change After ART and Mortality
(Normal [N = 2,226] vs Overweight/Obese [N = 1,842]) *Adjusted for VACS Index at ART initiation. BMI = body mass index. Yuh B, et al. Clin Infect Dis. 2015;60(12):

40 Alcohol Use More Harmful Among HIV+
Physiologic Frailty Mortality Estimated Total Drinks per Month Mortality Rates per 100 PYs 6 5 4 3 2 1 HIV+ HIV- Estimated Total Drinks per Month Mean VACS Score 45 40 35 30 25 20 15 HIV+ HIV- Justice AC, et al. Drug Alcohol Depend. 2016;161:

41 Exercise Compared to less active adults, greater activity:
Lowers mortality, CAD/CVD, HTN, diabetes, colon/breast cancer, and depression Decreases hip and vertebral fracture Improves weight maintenance WHO recommendations for adults: Perform 150 mins of moderate (75 mins of vigorous) aerobic/wk: In bouts of 10+ mins each Increase to 300 mins of moderate (150 mins of vigorous)/wk Muscle strengthening (resistance) 2+ days/wk Inactive people: start small and increase over time Exercise prescriptions, apps, and partnering with a friend help CAD = coronary artery disease; HTN = hypertension; WHO = World Health Organization. WHO. Global strategy on diet, physical activity, and health. Accessed 9/22/16; NIH Senior Health. Exercise: how to get started. Accessed 9/22/16.

42 Future Predictions HIV incidence will rise among 50+ yrs.
In 2014, 17% were 50+yrs. Presentation may differ from younger individuals Mainstreamed care for suppressed Cognition depends more upon psycho-active medication and VACS Index than “HAND” Liver injury-cirrhosis-HCC, will become major factors in HIV+/HCV+ and in HIV+/HCV- Ongoing microbial translocation Long term toxicity Fatty liver

43 Acknowledgements Consortium PI : AC Justice*
Scientific Collaborator (NIAAA): K Bryant Affiliated PIs: S Braithwaite, K Crothers*, R Dubrow *, DA Fiellin*, M Freiberg*, V LoRe* Participating VA Medical Centers: Atlanta (D. Rimland*, V Marconi), Baltimore (M Sajadi, R Titanji), Bronx (S Brown, Y Ponomarenko), Dallas (R Bedimo), Houston (M Rodriguez-Barradas, N Masozera), Los Angeles (M Goetz, D Leaf), Manhattan-Brooklyn (M Simberkoff, D Blumenthal, H Leaf, J Leung), Pittsburgh (A Butt, K Kraemer, M Freiberg, E Hoffman), and Washington DC (C Gibert, R Peck) Core and Workgroup Chairs: C Brandt, J Edelman, N Gandhi, J Lim, K McGinnis, KA Oursler, C Parikh, J Tate, E Wang, J Womack Staff: H Bathulapalli, T Bohan, J Ciarleglio, A Consorte, P Cunningham, L Erickson, C Frank, K Gordon, J Huston, F Kidwai-Khan, G Koerbel, F Levin, L Piscitelli, C Rogina, S Shahrir, M Skanderson Major Collaborators: VA Public Health Strategic Healthcare Group, VA Pharmacy Benefits Management, Massachusetts Veterans Epidemiology Research and Information Center (MAVERIC), Yale Center for Interdisciplinary Research on AIDS (CIRA), Center for Health Equity Research and Promotion (CHERP), ART-CC, NA-ACCORD, HIV-Causal Cross Cohort Collaborators: Richard Moore (NA-ACCORD), Jonathan Sterne (ART-CC), Brian Agan (DoD) Major Funding by: National Institutes of Health: AHRQ (R01-HS018372), NIAAA (U24-AA020794, U01-AA020790, U01-AA020795, U01-AA020799, U24-AA022001, U24 AA022007), NHLBI (R01-HL095136; R01-HL090342) , NIAID (U01-A ), NIMH (P30-MH062294), NIDA (R01DA035616), NCI (R01 CA173754) and the Veterans Health Administration Office of Research and Development (VA REA , VA IRR Merit Award) and Office of Academic Affiliations (Medical Informatics Fellowship) *Indicates individual is also the Chair of a Core or Workgroup

44 Acknowledgements QR Codes
COMpAAAS/Veterans Aging Cohort Study, a CHAART Cooperative Agreement, supported by the National Institutes of Health: National Institute on Alcohol Abuse and Alcoholism (U24-AA020794, U01-AA020790, U01-AA020795, U01-AA020799) and in kind by the US Department of Veterans Affairs.  In addition to grant support from NIAAA, we gratefully acknowledge the scientific contributions of Dr. Kendall Bryant, our scientific collaborator. QR Codes QR Code for VACS QR Code for VACS QR Code for VACS Homepage INDEX CALCULATOR INDEX CALCULATOR- MOBILE APP

45 VACS Project Team 2016


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