Affiliation: | 1. Prince of Songkla University, , Hat Yai, Songkhla, Thailand;2. Dental Division, Songkhla Rajanagarindra Psychiatric Hospital, , Songkhla, Thailand;3. Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, , Hat Yai, Songkhla, Thailand;4. Department of Oral Function and Physiology, School of Dentistry, University of Copenhagen, , Copenhagen, Denmark |