1. Cochrane; Cochrane Response; St Albans House 57-59 Haymarket London UK SW1Y 4QX
2. Norwegian Institute of Public Health; Division of Health Services; PO box 222 Skøyen 0213 Oslo Norway
3. University of Bern; Institute of Social and Preventive Medicine (ISPM); Bern Switzerland
4. Akershus University Hospital; Division of Mental Health Services; Lørenskog Norway
5. Cochrane; Editorial & Methods Department; St Albans House, 57 - 59 Haymarket London UK SW1Y 4QX
6. Regional Centre for Child and Adolescent Mental Health, Eastern and Southern Norway (RBUP); RBUP, Postboks 4623 Nydalen Oslo Norway 0405
7. University of Oslo; Faculty of Medicine; Oslo Norway