1. Department of Accident and Emergency, Queen Elizabeth Hospital, Jordan, Hong Kong
2. Department of Radiology, Gleneagles Hong Kong Hospital, Wong Chuk Hang, Hong Kong
3. Department of Accident and Emergency, North Lantau Hospital, Tung Chung, Hong Kong
4. Department of Radiology, Queen Mary Hospital, Hong Kong
5. Department of Accident and Emergency, Tuen Mun Hospital, Tuen Mun, Hong Kong