1. Department of Medicine, North District Hospital , Hong Kong Special Administrative Region, China
2. Department of Medicine, Alice Ho Miu Ling Nethersole Hospital , Hong Kong Special Administrative Region, China
3. Department of Medicine and Geriatrics, Kwong Wah Hospital , Hong Kong Special Administrative Region, China
4. Department of Medicine,The University of Hong Kong , Hong Kong Special Administrative Region, China
5. Department of Medicine, Queen Elizabeth Hospital , Hong Kong Special Administrative Region, China
6. Department of Medicine and Geriatrics, Caritas Medical Centre , Hong Kong Special Administrative Region, China
7. Department of Medicine, Tseung Kwan O Hospital , Hong Kong Special Administrative Region, China
8. Department of Medicine and Geriatrics, Pok Oi Hospital , Hong Kong Special Administrative Region, China
9. Department of Medicine, Pamela Youde Nethersole Eastern Hospital , Hong Kong Special Administrative Region, China
10. Department of Medicine and Geriatrics, Ruttonjee Hospital , Hong Kong Special Administrative Region, China
11. Department of Medicine, Yan Chai Hospital , Hong Kong Special Administrative Region, China
12. Department of Medicine & Therapeutics, The Chinese University of Hong Kong , Hong Kong Special Administrative Region, China