[1] Chinese Univ Hong Kong, Jockey Club Sch Publ Hlth & Primary Care, Shatin, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, SH Ho Res Ctr Infect Dis, Shatin, Hong Kong, Peoples R China
[3] Chinese Univ Hong Kong, Stanley Ho Ctr Emerging Infect Dis, Shatin, Hong Kong, Peoples R China
[4] Chinese Univ Hong Kong, Dept Med & Therapeut, Shatin, Hong Kong, Peoples R China
[5] Dept Hlth, Ctr Hlth Protect, Special Prevent Programme, Hong Kong, Peoples R China
[6] Princess Margaret Hosp, Dept Med & Geriatr, Kowloon, Hong Kong, Peoples R China
[7] Queen Elizabeth Hosp, Dept Med, Kowloon, Hong Kong, Peoples R China