Abstract

When the article listed above was published the authors in the “Correspondence to:” footnote were listed in the incorrect order. The corrected footnote is listed below. The authors apologize for this error and any confusion that it may have caused. *Correspondence to: Rongwei Ye, Institute of Reproductive and Child Health/Ministry of Health Key Laboratory of Reproductive Health, Department of Epidemiology and Biostatistics, School of Public Health Peking University, 38 Xueyuan Road, Beijing, 100191, China. E-mail: [email protected]; Linlin Wang, Institute of Reproductive and Child Health/Ministry of Health Key Laboratory of Reproductive Health, Department of Epidemiology and Biostatistics, School of Public Health Peking University, 38 Xueyuan Road, Beijing, 100191, China. E-mail: [email protected].

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