Lau Tze Kin, Yu Simon C H, Leung Tak Yeung, To Ka Fai, Fung Tak Yuen, Leung Tse Ngong
Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong.
BJOG. 2005 Jul;112(7):1002-4. doi: 10.1111/j.1471-0528.2005.00567.x.