1. School of Allied Health Sciences, Walailak University, Nakhon Si Thammarat 80160, Thailand
2. Research Institute for Health Sciences, Walailak University, Nakhon Si Thammarat 80160, Thailand
3. Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand
4. School of Medicine, Walailak University, Nakhon Si Thammarat 80160, Thailand