1. Department of Radiology and Medicine, Prince of Wales Hospital, Hong Kong, and Department of Anaesthesia, The Royal Women's Hospital, Melbourne, Vic.
2. Department of Radiology, Prince of Wales Hospital, Hong Kong.
3. Department of Radiology, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong.
4. Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong.
5. Department of Anaesthesia, The Royal Women's Hospital, Melbourne, Victoria, Australia.