Hernandez H N, Lewiss R E, Yousem D M, Clerico D M, Weinstein G S
Department of Otorhinolaryngology--Head and Neck Surgery, University of Pennsylvania, Philadelphia, USA.
Otolaryngol Head Neck Surg. 1998 Jun;118(6):871-3. doi: 10.1016/S0194-5998(98)70287-6.