1. Department of Obstetrics and Gynaecology, LKS Faculty of Medicine, The University of Hong Kong, 7/F, Laboratory Block, 21 Sassoon Road, Pokfulam, Hong Kong
2. Shenzhen Key Laboratory of Fertility Regulation, Department of Obstetrics and Gynecology, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
3. Department of Clinical Chemistry and Obstetrics and Gynecology, University of Helsinki and Helsinki University Central Hospital, HUS Helsinki, Finland