1. Stanford University and University of California-San Francisco; 300 Pasteur Dr. HH333 Stanford CA USA 94305-5317
2. University of Limerick; Department of Obstetrics and Gynaecology; Limerick Ireland
3. Global Network for Perinatal and Reproductive Health; Portland OR USA
4. Oregon Health and Science University; Department of Obstetrics and Gynecology; 3181 S.W. Sam Jackson Park Road Portland Oregon USA 97239