Affiliation: | 1. Department of Public Health, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital 3/F, Sai Ying Pun, Hong Kong, China;2. Department of Oral Rehabilitation, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital 4/F, Sai Ying Pun, Hong Kong, China;3. Department of Rehabilitation Medicine, Tung Wah Hospital, Sheung Wan, Hong Kong, China |