1. Jeffers J, Boynton S. Harrison’s principles of internal medicine. 13th ed. New York: McGraw-Hill, 1995: 418–21.
2. Linden B, Aguilar E, Allen S. Sinusitis in the nasotracheally intubated patient. Arch Otolaryngol Head Neck Surg 1988; 114: 860–1.
3. Way L. Current surgical diagnosis and treatment. 10th ed. East Norwalk, CT: Appleton & Lange, 1994: 874–7.
4. Simon H. Approach to the patient with sinusitis. In: Goroll A, May L, Mulley A, editors. Primary care medicine. 3rd ed. Philadelphia: Lippincott, 1995: 1004–7.
5. Tierney L, McPhee S, Papadakis M. Current medical diagnosis and treatment. 34th ed. East Norwalk, CT: Appleton & Lange, 1995: 182–4.