Health Economics Research Office, Helen Joseph Hospital, Johannesburg, Gauteng, South Africa
Boston Medical center, Boston, Massachusetts, United States
General Clinical Research Center/Boston University School of Public Health, Boston, Massachusetts, United States
Boston Veterans Healthcare System, Boston, Massachusetts, United States
Boston University, School of Medicine, Boston, Massachusetts, United States
Boston University Medical Campus, Boston, Massachusetts, United States
UCLA Neuropsychiatric Institute, Los Angeles, California, United States
University of North Carolina Chapel Hill, Chapel Hill, North Carolina, United States
North Shore - Long Island Jewish Hospital, Great Neck, New York, United States