Affiliation: | 1. Wan Chai Clinic, Hong Kong, China;2. Ma Tau Chung Clinic, Hong Kong, China;3. Wong Tai Sin Clinic, Hong Kong, China;4. Tsuen Wan Centre, Hong Kong, China;5. Tai Wai Clinic, Hong Kong, China;6. Yuen Long Clinic, The Family Planning Association of Hong Kong, Hong Kong SAR, China |