[1] Hong Kong Polytech Univ, Sch Nursing, Kowloon, Hong Kong, Peoples R China
[2] Pamela Youde Nethersola Eastern Hosp, Dept Obstet & Gynaecol, Hong Kong, Hong Kong, Peoples R China
[3] Hong Kong Polytech Univ, Sch Nursing, Hong Kong, Hong Kong, Peoples R China