1. Drossman DA, Sandler RS, McKee DC, Lovitz AJ. Bowel patterns among subjects not seeking health care. Gastroenterology 1982;83:529–34.
2. Whitehead WE, Chaussade S, Corazziari E, Kumar D. Report of an international workshop on management of constipation. Int Gastroenterol 1991;4:99–113.
3. Nogueras JJ, Wexner SD. Biofeedback for nonrelaxing puborectalis syndrome. Semin Colon Rectal Surg 1992;3:120–4.
4. Wexner SD, Bartolo DC, eds. Constipation: etiology, evaluation, and management. Oxford: Butterworth-Heinemann, 1996.
5. Jorge JM, Wexner SD, Ehrenpreis ED. The lactulose hydrogen breath test as a measure of orocaecal transit time. Eur J Surg 1994;160:409–16.