1 Department of Obstetrics and Gynecology, University of Hong Kong, Hong Kong, China.
2 Department of Obstetrics and Gynecology and Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8L6, Canada.
3 Chronic Disease Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada.
4 State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macao, China.
5 Department of Pathology, University of Hong Kong, Hong Kong, China.