[1] Univ Hong Kong, Dept Family Med & Primary Care, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Dept Paediat & Adolescent Med, Hong Kong, Hong Kong, Peoples R China
[3] Univ Hong Kong, Sch Nursing, Hong Kong, Hong Kong, Peoples R China
[4] Univ Hong Kong, Dept Med, Hong Kong, Hong Kong, Peoples R China
[5] Univ Hong Kong, Dept Social Work & Social Adm, Hong Kong, Hong Kong, Peoples R China