1 Department of Obstetrics and Gynaecology, United Christian Hospital, Hong Kong SAR, China.
2 Department of Obstetrics and Gynaecology, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
3 Department of Obstetrics and Gynaecology, Queen Mary Hospital, Hong Kong SAR, China.
4 Department of Paediatrics and Adolescent Medicine, School of Clinical Medicine, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
5 Department of Paediatrics and Adolescent Medicine, Queen Mary Hospital, Hong Kong SAR, China.
6 Department of Paediatrics and Adolescent Medicine, United Christian Hospital, Hong Kong SAR, China.