1. Stellenbosch University and Tygerberg Hospital; Department of Obstetrics and Gynaecology, Faculty of Health Sciences; PO Box 19063 Tygerberg Western Cape South Africa 7505
2. Lund University; Dag Hammarsköldsväg 4b Lund Sweden 22464
3. Lund University; Department of Obstetrics and Gynecology; Skanes Universitetssjukhus/Lund Lund Sweden 22185