Corresponding Author

Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China

Department of Women's Health, Provincial Key Clinical Specialty of Woman and Child Health, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong, China

Provincial Clinical Research Center for Child Health, Guangdong, China

Nuffield Department of Women's and Reproductive Health, University of Oxford, Oxford, UK

Correspondence

Xiu Qiu and Jian-Rong He, Division of Birth Cohort Study, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, No. 9 Jinsui Road, Tianhe District, Guangzhou 510623, China.

Emails: xiu.qiu@bigcs.org, qxiu0161@163.com (X.Q.); jianrong.he@bigcs.org (J.-R.H.)

Contribution: Conceptualization (equal), Formal analysis (supporting), Project administration (equal), Writing - review & editing (equal)