1 Division of Oral and Maxillofacial Surgery, Department of Stomatology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
2 Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
3 School of Dentistry, College of Medicine, National Cheng Kung University, Tainan, Taiwan.