1. Danube University Krems; Department of Evidence-based Medicine and Clinical Epidemiology; Krems Austria
2. University of North Carolina at Chapel Hill; Department of Psychiatry; 101 Manning Dr., CB# 7160 Chapel Hill North Carolina USA 27599-7160
3. RTI International; 3040 Cornwallis Road Research Triangle Park North Carolina USA 27709
4. University of North Carolina at Chapel Hill; Department of Social Medicine; Department of Family Medicine; CB#7240, School of Medicine Chapel Hill North Carolina USA 27599-7240
5. Medical University of Vienna; Department of Psychiatry and Psychotherapy; Waehringer Guertel 18-20 Vienna Austria 1090
6. Danube University Krems; Cochrane Austria; Dr.-Karl-Dorrek-Strasse 30 Krems Austria 3500