[1] Chinese Univ Hong Kong, Dept Med & Therapeut, Hong Kong, Hong Kong, Peoples R China
[2] Queen Elizabeth Hosp, Dept Anesthesiol, Hong Kong, Hong Kong, Peoples R China
[3] Alice Ho Miu Ling Nethersole Hosp & N Di, Dept Anesthesiol & Operating Serv, Hong Kong, Hong Kong, Peoples R China
[4] Pamela Youde Nethersole Eastern Hosp, Dept Med, Hong Kong, Hong Kong, Peoples R China
[5] Univ Hong Kong, Dept Orthoped Surg, Hong Kong, Hong Kong, Peoples R China
[6] Ruttonjee & Tang Shiu Kin Hosp, Dept Geriatr, Hong Kong, Hong Kong, Peoples R China