Leung Pui Ling, Ng Pui Shan, Lok Ingrid Hung, Yuen Pong Mo
Department of Obstetrics and Gynecology, Prince of Wales Hospital, New Territories East Cluster, The Chinese University of Hong Kong, Hong Kong SAR.
Acta Obstet Gynecol Scand. 2005 Sep;84(9):921-2. doi: 10.1111/j.0001-6349.2005.0414d.x.