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ATTENTION DEFICIT HYPERACTIVITY DISORDER AND FUNCTIONAL DEFECATION DISORDERS IN CHILDREN Sophie Kuizenga-Wessel, Ilan J.N. Koppen, Mana H. Vriesman, Carlo Di Lorenzo, Marieke van Dijk, Maureen L.R. Beelen, Michael Groeneweg, Reino J. Stoffelsen, Marc A. Benninga Journal of Pediatric Gastroenterology and Nutrition 2018;66:244-249