1. Department of Maternal and Child Health, Xiangya School of Public Health Central South University Changsha China
2. Department of Reproductive Immunology, Affiliated Shenzhen Maternity and Child Healthcare Hospital Southern Medical University Shenzhen China
3. Saw Swee Hock School of Public Health National University of Singapore Singapore Singapore
4. International Institute of Spatial Lifecourse Epidemiology (ISLE) Enschede the Netherlands
5. Department of Epidemiology and Health Statistics, Xiangya School of Public Health Central South University Changsha China
6. Department of Health and Human Physiology University of Iowa Iowa City Iowa USA
7. Department of Epidemiology University of Iowa Iowa City Iowa USA
8. Faculty of Geo–information Science and Earth Observation University of Twente Enschede the Netherlands