About the Authors

Anita S. Y. Kan

kansya@hku.hk

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Elizabeth T. Lau

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

W. F. Tang

Affiliation Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China

Sario S. Y. Chan

Affiliation Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Simon C. K. Ding

Affiliation Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Kelvin Y. K. Chan

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

C. P. Lee

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Pui Wah Hui

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Brian H. Y. Chung

Affiliations Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China, Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China

K. Y. Leung

Affiliation Department of Obstetrics and Gynaecology, Queen Elizabeth Hospital, Hong Kong Special Administrative Region, China

Teresa Ma

Affiliation Department of Obstetrics and Gynaecology, Queen Elizabeth Hospital, Hong Kong Special Administrative Region, China

Wing C. Leung

Affiliation Department of Obstetrics and Gynaecology, Kwong Wah Hospital, Hong Kong Special Administrative Region, China

Mary H. Y. Tang

Affiliations Department of Obstetrics and Gynaecology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong Special Administrative Region, China, Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong Special Administrative Region, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ASYK ETL WFT MHYT. Performed the experiments: ETL WFT SSYC SCKD KYKC. Analyzed the data: ASYK ETL WFT SSYC SCKD KYKC. Contributed reagents/materials/analysis tools: ASYK CPL PWH BHYC KYL TM WCL MHYT. Wrote the paper: ASYK ETL WFT SSYC SCKD KYKC CPL PWH BHYC KYL TM WCL MHYT.