1. Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health; Xinhua Hospital; Shanghai Jiao-Tong University School of Medicine; Shanghai China
2. Department of Obstetrics and Gynecology; Sainte-Justine Hospital Research Center; University of Montreal; Montreal Canada
3. Departments of Clinical Biochemistry and Pediatrics; Sainte-Justine Hospital Research Center; University of Montreal; Montreal Canada
4. Departments of Medicine, Endocrinology and Nephrology; CHU-Quebec Laval University Research Center; Quebec City Canada
5. Department of Obstetrics and Gynecology; University of Sherbrooke; Sherbrooke Canada
6. Department of Obstetrics and Gynecology; Prosserman Center for Population Health Research; Lunenfeld-Tanenbaum Research Institute; Mount Sinai Hospital; University of Toronto; Toronto Canada