Union Alternative Georgia, Tbilisi, Georgia
University of Pennsylvania, Philadelphia, Pennsylvania, United States
Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States
Carnegie Mellon University, Pittsburgh, Pennsylvania, United States
University of Pennsylvania Center for Clinical Epidemiology and Biostatistics, Philadelphia, Pennsylvania, United States
University of Pennsylvania, Philadelphia, Pennsylvania, United States
University of Pennsylvania. Clinical Trials Unit, Philadelphia, Pennsylvania, United States
Botkin Infectious Disease Hospital, Leningrad, Russian Federation
SAA National Center of Addiction Medicine, Vogur Hospital, Storhofda 45, Reykjavík, Iceland
University of California, Los Angeles, Los Angeles, California, United States
Northwestern University, Chicago, Illinois, United States
University of Iowa, Iowa City, Iowa, United States