High-resolution anorectal manometry in children with functional constipation: a single-centre experience before and after treatment - Mortada El-Shabrawi; Hind M. Hanafi; Manal M.A.H. Abdelgawad; Fetouh Hassanin; Aml A.A. Mahfouze; Ahmed F.M. Khalil; Saeed Elsayed Elsawey (Gastroenterology Review)