Institution: | 1. Prince of Songkla University, , Hat Yai, Songkhla, Thailand;2. Department of Pathology, Faculty of Medicine, Prince of Songkla University, , Hat Yai, Songkhla, Thailand;3. Department of Oral Surgery and Oral Medicine, Faculty of Dentistry, Srinakharinwirot University, , Bangkok, Thailand;4. Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, , Hat Yai, Songkhla, Thailand |