1 Department of Public Health Sciences, Section for Epidemiology and Public Health Intervention Research (EPHIR), Karolinska Institutet, Stockholm, Sweden mats.hallgren@ki.se.
2 Department of Public Health Sciences, Section for Epidemiology and Public Health Intervention Research (EPHIR), Karolinska Institutet, Stockholm, Sweden.
3 Department of Clinical Sciences, Lund, Division of psychiatry, Lund University, Lund, Sweden.