1. Zimmer A, Clakins E, Hadley E, Ostfield A, Kaye J, Kaye D, Conducting clinical research in geriatric populations. Ann Intern Med 1985;102:276–83.
2. Texter, E, ed. The aging gut: pathophysiology, diagnosis, and management. New York: Masson Publishing, 1983:153.
3. Calabrese CT, Adam YG, Volk H. Geriatric colon cancer. Am J Surg 1973;125:181–4.
4. Silverberg E. Cancer statistics, 1985 CA 1985;35:19–56.
5. Irvin G, Robinson D, Hubbard S. Operative risks in patients with colorectal cancer. Am Surg 1985;51:418–22.