1. Cochrane Austria, Department for Evidence-based Medicine and Evaluation; Danube University Krems; Krems Austria
2. Department for Psychotherapy and Psychosocial Health; Danube University Krems; Krems Austria
3. Department of Psychiatry and Psychotherapy; Medical University of Vienna; Vienna Austria
4. Department of General Practice and Family Medicine; Medical University of Vienna; Vienna Austria
5. Department of Psychiatry, School of Medicine; University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA
6. Department of Epidemiology, Gillings Global School of Public Health; University of North Carolina at Chapel Hill; Chapel Hill North Carolina USA
7. RTI International; Research Triangle Park North Carolina USA