1. Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Shatin, Hong Kong
2. Stanley Ho Centre for Emerging Infectious Diseases, The Chinese University of Hong Kong, Shatin, Hong Kong
3. Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Shatin, Hong Kong
4. Integrated Treatment Centre, Department of Health, Kowloon Bay, Hong Kong
5. Department of Medicine and Geriatrics, Princess Margaret Hospital, Lai Chi Kok, Hong Kong
6. Department of Medicine, Queen Elizabeth Hospital, Kowloon, Hong Kong