1. Department of Epidemiology; Harvard T. H. Chan School of Public Health; Boston MA USA
2. Department of Pediatrics; University of California; San Diego
3. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine; Brigham and Women's Hospital and Harvard Medical School
4. New York State Psychiatric Institute, New York; the Department of Psychiatry; College of Physicians and Surgeons of Columbia University; New York