1. Department of Anatomical and Cellular Pathology, State Key Laboratory in Oncology in South China, Prince of Wales Hospital; The Chinese University of Hong Kong; Hong Kong
2. Li Ka Shing Institute of Health Science, Prince of Wales Hospital; The Chinese University of Hong Kong; Hong Kong
3. Department of Obstetrics and Gynecology, Prince of Wales Hospital; The Chinese University of Hong Kong; Hong Kong
4. Department of Clinical Oncology; Queen Elizabeth Hospital; Hong Kong
5. Université Paris-Sud-11; CNRS-UMR 8126 and Institut de Cancérologie Gustave Roussy; 39 Rue Camille Desmoulins F-94805 Villejuif France