1. Obstructive defecation: a failure of rectoanal coordination;Rao;Am J Gastroenterol,1998
2. Dyssynergic defecation;Rao;Gastroenterol Clin North Am,2001
3. Anismus in chronic constipation;Preston;Dig Dis Sci,1985
4. Functional disorders of the anorectum. International Working Party Consensus Rome Criteria II;Whitehead;Gut,1999
5. Effects of biofeedback on obstructive defecation: reconditioning of the defecation reflex?;Papachrysostomou;Gut,1994