1. Tuberculosis and Chest Service, Department of Health, Hong Kong SAR, China
2. Special Preventive Programme, Department of Health, Hong Kong SAR, China
3. Hong Kong Tuberculosis, Chest and Heart Diseases Association, Hong Kong SAR, China
4. Department of Medicine, Queen Elizabeth Hospital, Hong Kong SAR, China
5. Department of Medicine and Geriatrics, Princess Margaret Hospital, Hong Kong SAR, China