1. Faculty of Caring Science, Work Life and Social Welfare, University of Borås, Borås, Sweden
2. Sahlgrenska Academy, Institute of Health and Care Sciences, University of Gothenburg, Gothenburg, Sweden
3. Department of Midwifery, School of Health Sciences, University of Iceland, Reykjavik, Iceland
4. Obstetric Unit, Sahlgrenska University Hospital, Gothenburg, Sweden