1.   Data from these two patients are included in the statistical analysis of the diagnostic anorectal manometry, as they were incontinent.

2.   At diagnostic anorectal manometry, they showed an isolated alteration of squeeze duration without any impairment of internal anal sphincter function.

3.   Clearly, they are complementary and appropriate studies -- radiography, anorectal manometry, electromyography, cystometry -- must be performed.