1. The University Department of Medicine, Professorial Block, Queen Mary Hospital, University of Hong Kong, Pokfulam Road, Hong Kong, Peoples' Republic of China
2. The University Department of Pathology, Queen Mary Hospital, University of Hong Kong, Pokfulam Road, Hong Kong, Peoples' Republic of China
3. The University Department of Surgery, Queen Mary Hospital, University of Hong Kong, Pokfulam Road, Hong Kong, Peoples' Republic of China
4. The University Department of Paediatrics, Queen Mary Hospital, University of Hong Kong, Pokfulam Road, Hong Kong, Peoples' Republic of China