1. KY Chan (corresponding author): Palliative Medical Unit, Grantham Hospital, 125 Wong Chuk Hang, Hong Kong, China;
2. ML Chan: Department of Psychiatry, Kowloon Hospital, Hong Kong, China;
3. TCC Yau: Departments of Medicine and Surgery, University of Hong Kong Medical Centre, Queen Mary Hospital, Hong Kong, China;
4. CW Li, HW Cheng, MK Sham: Palliative Medical Unit, Grantham Hospital, Hong Kong, China