1. Department of Social Work at University of Gothenburg; Gothenburg Sweden
2. HBSC; Östersund Sweden
3. Public Health Agency of Sweden; Stockholm Sweden
4. Department of Social Sciences at University of Akureyri; Akureyri Iceland
5. Department of Health Sciences at University of Jyväskylä; Jyväskylä Finland
6. Centre for Applied Biostatistics at University of Gothenburg; Gothenburg Sweden