[1] Natl Cheng Kung Univ, Coll Med, Dept Otolaryngol, Natl Cheng Kung Univ Hosp, Tainan 70101, Taiwan
[2] Natl Cheng Kung Univ, Natl Cheng Kung Univ Hosp, Dept Pathol, Coll Med, Tainan 70101, Taiwan
[3] Natl Inst Canc Res, Natl Hlth Res Inst, Tainan, Taiwan