Affiliation: | 1. Department of Otolaryngology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C.;2. Laboratory of Epidemiology and Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C.;3. Fooyin University Hospital, Ping-Tong, Taiwan, R.O.C. |