1. Shenzhen Birth Cohort Study Center, Nanshan Maternity and Child Healthcare Hospital of Shenzhen, Shenzhen, China
2. Department of Epidemiology, University of Iowa College of Public Health, Iowa City
3. Department of Maternal and Child Health, Sun Yat-sen University School of Public Health, Guangzhou, Guangdong Province, China
4. Department of Pediatrics, Guangdong Women and Children Hospital, Guangzhou, Guangdong Province, China
5. Department of Obstetrics & Gynecology, University of Iowa, Iowa City
6. Center for Hypertension Research, University of Iowa, Iowa City