[1] Chinese Univ Hong Kong, Prince Wales Hosp, Dept Obstet & Gynaecol, Shatin, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Prince Wales Hosp, Dept Paediat & Adolescent Med, Shatin, Hong Kong, Peoples R China
[3] Chinese Univ Hong Kong, Prince Wales Hosp, Dept Med & Therapeut, Shatin, Hong Kong, Peoples R China