Caffeine as an Adjuvant Therapy to Opioids in Cancer Pain: A Randomized, Double- Blind, Placebo-Controlled Trial Sang-Yeon Suh, MD, PhD, Youn Seon Choi, MD, PhD, Sang Cheul Oh, MD, PhD, Young Sung Kim, MD, Kyunghee Cho, MD, PhD, Woo Kyung Bae, MD, MPH, Ju Hyun Lee, MD, MPH, Ah-ram Seo, MS, Hong-Yup Ahn, PhD Journal of Pain and Symptom Management Volume 46, Issue 4, Pages 474-482 (October 2013) DOI: 10.1016/j.jpainsymman.2012.10.232 Copyright © 2013 U.S. Cancer Pain Relief Committee Terms and Conditions
Fig. 1 Study flow diagram. Journal of Pain and Symptom Management 2013 46, 474-482DOI: (10.1016/j.jpainsymman.2012.10.232) Copyright © 2013 U.S. Cancer Pain Relief Committee Terms and Conditions