1. Department of Accident and Emergency, Tuen Mun Hospital, Hong Kong SAR, China
2. Department of Accident and Emergency, Tin Shui Wai Hospital, Hong Kong SAR, China
3. Department of Accident and Emergency, Queen Mary Hospital, Hong Kong SAR, China
4. Department of Accident and Emergency, Ruttonjee & Tang Shiu Kin, Hospitals, Hong Kong SAR, China; Fire Services Department, Hong Kong SAR, China