[1] Indiana Univ Sch Med, Indianapolis, IN USA
[2] Johns Hopkins Sch Publ Hlth, Baltimore, MD USA
[3] Virginia Commonwealth Univ, Div Gastroenterol Hepatol & Nutr, Richmond, VA USA
[4] Univ Calif San Diego, San Diego, CA USA
[5] St Louis Univ, St Louis, MO USA
[6] Washington State Univ, Pullman, WA USA
[7] Duke Univ, Durham, NC USA
[8] Cleveland Clin Fdn, Cleveland, OH USA
[9] Univ Southern Calif, Los Angeles, CA USA