1. Thomas Jefferson University Hospital; Rothman Institute at Jefferson; 925 Chestnut Street, 5th Floor Philadelphia PA USA 19107-4216
2. Tehran University of Medical Sciences; Sina Trauma and Surgery Research Center, Sina Hospital; Hassan-Abad Square, Imam Khomeini Ave Tehran Tehran Iran 11365-3876
3. The Institute of Mental Health, a partnership between the University of Nottingham and Nottinghamshire Healthcare NHS Trust; Cochrane Schizophrenia Group; Jubilee Campus Nottingham UK NG7 2TU
4. Iran University of Medical Sciences; Department of Community Medicine; Tehran Tehran Iran
5. Oregon Health & Science University; Department of Medical Informatics & Clinical Epidemiology; 3181 SW Sam Jackson Park Rd. Mail Code: BICC Portland Oregon USA 97239