1. Daniels EJ. Physiology of the colon. Colon and Rectal Surgery, 4th ed, Lippincott-Raven: Philadelphia; 1998;27-36.
2. Keighley MB, Williams NS. Constipation. Surgery of the Anus, Rectum and Colon WB Saunders Co: London; 1993;609-638.
3. Guyton AC, Hall JE. The gastrointestinal tract. Human Physiology and Mechanisms of Disease 6th, WB Saunders CO: London; 1997;511-536.
4. Goligher JC. Surgical anatomy and physiology of the anus, rectum, and colon. Surgery of the Anus, Rectum and Colon. 5th Ballière Tindall: London; 1984;1-47.
5. Is the rectum usually empty?—A quantitative study in subjects with and without diarrhea