1. Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Department of Obstetrics and Gynecology, Södra Älvsborg Hospital, Borås, Sweden
3. Department of Obstetrics and Gynecology, Sahlgrenska University Hospital, Gothenburg, Sweden
4. Department of Cardiothoracic Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
5. Department of Molecular and Clinical Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden