[1] Univ Hong Kong, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[2] Univ Glasgow, Inst Hlth & Wellbeing, Glasgow G12 8RZ, Lanark, Scotland
[3] Univ Hong Kong, Dept Social Work & Social Adm, Hong Kong, Peoples R China
[4] Univ Hong Kong, Dept Family Med & Primary Care, Hong Kong, Peoples R China
[5] Univ Hong Kong, Dept Pharmacol & Pharm, Hong Kong, Peoples R China
[6] Family Planning Assoc Hong Kong, Hong Kong, Peoples R China