1. Department of Paediatrics and Adolescent Medicine, Princess Margaret Hospital, Lai Chi Kok, New Territories, Hong Kong
2. Department of Paediatrics, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
3. Department of Microbiology, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
4. Department of Microbiology and Pathology, Queen Mary Hospital, University of Hong Kong, Pokfulam, Hong Kong
5. Department of Surgery, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
6. Department of Obstetrics and Gynecology, Princess Margaret Hospital, Lai Chi Kok, New Territories, Hong Kong