1. Imperial College Parturition Research Group; Academic Department of Obstetrics & Gynaecology; Imperial College School of Medicine; Chelsea and Westminster Hospital; London; UK
2. Leukocyte Biology Section; National Heart & Lung Institute; Imperial College London; London; UK
3. The International Peace Maternity and Child Health Hospital; Shanghai; China
4. School of Medicine; University of Glasgow; Glasgow; UK
5. Center for Pregnancy and Newborn Research; University of Texas Health Science Center San Antonio; San Antonio; TX; USA