Po Mui Lam1, Christine Briton-Jones2, Che Kwok Cheung2, See Wai Leung1, Lai Ping Cheung1, Christopher Haines2
1Department of Obstetrics and Gynecology, Prince of Wales Hospital Shatin, Hong Kong SAR, China
2Department of Obstetrics and Gynecology, The Chinese University of Hong Kong, Hong Kong SAR, China