1. Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Ngan Shing Street, Shatin, New Territories, Hong Kong
2. Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Ngan Shing Street, Shatin, New Territories, Hong Kong
3. Department of Obstetrics and Gynecology, UCMS and GTB Hospital, Dilshad Garden, Delhi 110092, India