[1] Dept Hlth, TB & Chest Serv, Hong Kong, Hong Kong, Peoples R China
[2] Grantham Hosp, TB & Chest Unit, Hong Kong, Hong Kong, Peoples R China
[3] Kowloon Hosp, Dept Resp Med, Kowloon, Hong Kong, Peoples R China
[4] Chinese Univ Hong Kong, Stanley Ho Ctr Emerging Infect Dis, Hong Kong, Hong Kong, Peoples R China