“…42,60,72, 84,85,93,109,115,118,140,161–163,171,172,181,184,186,187,230–232,238, 240,256,260,308,314,320,329,342,344,355 In 13 studies (4.2%) 53, 58,65,108,111,142,143,145,159,316,337,343,351 non-validated questionnaires were used. Anal manometry was used in 126 studies (41.2%) 50,53,55,57,61,65,72,73,77,78,80,82,83, 85,86,91,92,95,96,…”