[1
]
Division of Mental Health, Norwegian Institute of Public Health, Norway; Department
Clinical Epidemiology, Aarhus University, Denmark. Electronic address: elisabeth.svensson@dce.au.dk.
[2
]
Department of Health Economics and Health Management, Institute of Health and Society,
University of Oslo, Norway.
[3
]
Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Sweden.
[4
]
Division of Mental Health, Norwegian Institute of Public Health, Norway; Institute
of Psychiatry, University of Oslo, Norway.
[5
]
Department of Health Economics and Health Management, Institute of Health and Society,
University of Oslo, Norway; Department of Biostatistics, Institute of Basal Medical
Sciences, University of Oslo, Norway.