The Chinese University of Hong Kong (CUHK) - Department of Medicine & Therapeutics, The Chinese University of Hong Kong (CUHK) - Department of Medicine & Therapeutics, The Chinese University of Hong Kong (CUHK) - Department of Medicine & Therapeutics, Government of the Hong Kong Special Administrative Region - Tuen Mun Hospital, The University of Hong Kong - Department of Medicine, The University of Hong Kong - Department of Medicine, Government of the Hong Kong Special Administrative Region - Department of Medicine & Geriatrics, Government of the Hong Kong Special Administrative Region - Department of Medicine & Geriatrics, Pok Oi Hospital - Department of Medicine & Geriatrics, Tseung Kwan O Hospital - Department of Medicine, Caritas Medical Centre - Department of Medicine & Geriatrics, Queen Elizabeth Hospital, Hong Kong - Department of Medicine, Pamela Youde Nethersole Eastern Hospital - Department of Medicine, Princess Margaret Hospital - Department of Medicine, Ruttonjee Hospital - Department of Medicine & Geriatrics, Tai Po Hospital - Department of Medicine & Geriatrics and The Chinese University of Hong Kong (CUHK) - Department of Medicine & Therapeutics