1. University of Central Lancashire; Research in Childbirth and Health (ReaCH) unit; Preston UK PR1 2HE
2. The University of Liverpool; Cochrane Pregnancy and Childbirth Group, Department of Women's and Children's Health; First Floor, Liverpool Women's NHS Foundation Trust Crown Street Liverpool UK L8 7SS
3. University of Western Sydney, Family and Community Health Research Group; School of Nursing and Midwifery; Locked Bag 1797 Penrith Routh DC NSW Australia 1797
4. University of the Witwatersrand/University of Fort Hare/East London Hospital complex; Effective Care Research Unit; East London South Africa