[1] UNIV PITTSBURGH, SCH MED, PITTSBURGH, PA 15213 USA
[2] W VIRGINIA UNIV, SCH MED,DEPT SURG, MORGANTOWN, WV USA
[3] EYE & EAR HOSP, PITTSBURGH, PA USA
[4] MERCY HOSP, DIV FACIAL PLASTIC SURG, PITTSBURGH, PA USA
[5] MERCY HOSP, DIV OTOLARYNGOL & MAXILLOFACIAL SURG, PITTSBURGH, PA USA
[6] W VIRGINIA UNIV, SCH MED,DEPT OTOLARYNGOL, Morgantown, WV USA
[7] MERCY HOSP, DIV OTOLARYNGOL, Pittsburgh, PA USA