1. High School Football and Risk of Neurodegeneration: A Community-Based Study 
Rodolfo Savica, MD, MSc, Joseph E. Parisi, MD, Lester E. Wold, MD, Keith A. Josephs, MD, MST, MSc, J. Eric Ahlskog, PhD, MD 
Mayo Clinic Proceedings 
Volume 87, Issue 4, Pages (April 2012)
DOI: /j.mayocp
Copyright © 2012 Mayo Foundation for Medical Education and Research Terms and Conditions

2. FIGURE 1
One of the football players from Rochester Lourdes High School in 1946 wearing a “dog-ear” leather helmet.
Photo courtesy of Lourdes High School, Rochester, MN. Used with permission.
Mayo Clinic Proceedings  , DOI: ( /j.mayocp )
Copyright © 2012 Mayo Foundation for Medical Education and Research Terms and Conditions

3. FIGURE 2
Flowchart of the study. ALS = amyotrophic lateral sclerosis; PD = Parkinson disease; REP = Rochester Epidemiology Project.
Mayo Clinic Proceedings  , DOI: ( /j.mayocp )
Copyright © 2012 Mayo Foundation for Medical Education and Research Terms and Conditions