Pinnacle Clinical Research, PLLC, San Antonio, Texas, United States
American Research Corporation at the Texas Liver Institute, San Antonio, Texas, United States
Gastro One, Germantown, Tennessee, United States
Hospital Ramón Y Cajal, Madrid, Spain
La Fe Hospital, Valencia, Spain
Hospital Clínic de Barcelona, Barcelona, Spain
Hospital Universitario Donostia, San Sebastian, Spain
Hospital Universitario Virgen De La Arrixaca, Murcia, Spain
Complexo Hospitalario Universitario de Montecelo, Pontevedra, Spain
Central Research Institute of Epidemiology, Moscow, Russian Federation
First Moscow State Medical University I.M. Sechenov, Moscow, Russian Federation
Limited Liability Company "Clinic Tour", Moscow, Russian Federation
Be Well Medical Center, Berkley, Michigan, United States
AIDS Research Consortium of Atlanta, Atlanta, Georgia, United States
Emory University, Atlanta, Georgia, United States