1. Vanderbilt University; School of Nursing; 314 Godchaux Hall 21st Avenue South Nashville Tennessee USA 37240-0008
2. University of Cape Town; School of Child and Adolescent Health, and Department of Human Biology; Cape Town South Africa
3. Professor Emerita, University of Florida; Case Western Reserve University; Oak Hammock at the University of Florida 5000 SW 25th Boulevard #2108 Gainesville FL USA 32608-8901
4. 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