[1] Hualien Armed Forces Gen Hosp, Div Dent, Hualien, Taiwan
[2] Triserv Gen Hosp, Dent Dept, Div Oral & Maxillofacial Surg, Taipei, Taiwan
[3] Natl Def Med Ctr, Sch Dent, Taipei, Taiwan
[4] Triserv Gen Hosp, Div Oral & Maxillofacial Surg, 325 Cheng Kung Rd,Sec2, Taipei 114202, Taiwan