[1] Univ Hong Kong, Shenzhen Hosp, Dept Family Med & Primary Care, 1 Haiyuan 1st Rd, Shenzhen 518009, Guangdong Provi, Peoples R China
[2] Univ Hong Kong, Li Ka Shing Fac Med, Sch Clin Med, Dept Family Med & Primary Care, Hong Kong, Peoples R China
[3] HKU, LKS Fac Med, Dept Pharmacol & Pharm, Pokfulam, 2-F Lab Block,21 Sassoon Rd, Hong Kong, Peoples R China
[4] Hosp Author, Dept Family Med & Primary Hlth Care, Kowloon West Cluster, Hong Kong, Peoples R China