1 MD, Dip., Thai Board of Family Medicine, Academic Fellowship Department of Clinical Medicine, School of Medicine, Walailak University, Thasala, Nakhon Si Thammarat, Thailand.
2 Family Medicine Clinic, Walailak University Hospital, Nakhon Si Thammarat, Thailand. Email: apichai.wa@wu.ac.th.
3 MD, Dip., Thai Board of Pediatrics, Pediatric Hematology and Oncology, Research Fellowship Phramongkutklao Hospital and College of Medicine, Bangkok, Thailand.
4 MD, Dip., Thai Board of Family Medicine, MSc Family Medicine Unit, Thasala Hospital, Nakhon Si Thammarat, Thailand.