1 Division of Oral and Maxillofacial Surgery, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
2 Division of Oral Pathology and Radiology, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
3 Division of Family Dentistry, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
4 Division of Family Dentistry, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan; Department of Oral Hygiene, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. Electronic address: juhuwu@kmu.edu.tw.