1. Yale School of Medicine, Yale New Haven Health Services Corporation Center for Outcome Research and Evaluation, and VA Connecticut Healthcare System; West Haven
2. Brigham and Women's Hospital; Boston Massachusetts
3. Brigham and Women's Hospital, Harvard Medical School, and Harvard School of Public Health; Boston Massachusetts
4. Lund University, Lund, Sweden, and Boston University School of Medicine; Boston Massachusetts
5. University of Sydney and Royal North Shore Hospital; Sydney New South Wales Australia
6. Lund University; Lund Sweden
7. Brigham and Women's Hospital, Harvard Medical School, and Boston University School of Public Health; Boston Massachusetts