1. Faculty of Health Sciences, Buskerud University College, P.O. Box 7053, 3007 Drammen, Norway
2. Department of Health Promotion, Faculty of Health Sciences, Vestfold University College, P.O. Box 2243, 3101 Tønsberg, Norway
3. Centre for Women’s, Family and Child Health, Faculty of Health Sciences, Vestfold University College, P.O. Box 2243, 3101 Tønsberg, Norway