Referencias
Cummings CW, Flint PW, Haughey BH, et al. Otolaryngology: Head & Neck Surgery. 4th ed. St. Louis, Mo: Mosby; 2005:3226.
Rakel P, ed. Conn’s Current Therapy 2005. 57th ed. Philadelphia, PA: WB Saunders; 2005:226-227.
Goldman L, Ausiello D. Cecil Textbook of Medicine, 22nd ed. Philadelphia, PA: WB Saunders; 2004:240-241.