1. The University of Manchester; School of Nursing, Midwifery and Social Work; Jean McFarlane Building Oxford Road Manchester UK M13 9PL
2. The University of Liverpool; Department of Women's and Children's Health; First Floor, Liverpool Women's NHS Foundation Trust Crown Street Liverpool UK L8 7SS
3. Faculty of Health Sciences; Department of Obstetrics and Gynecology, School of Clinical Medicine, University of the Witwatersrand, South Africa and Delta State University, Nigeria; PO Box 1718 Johannesburg South Africa 2060