Functional urinary and fecal incontinence in neurologically normal children: symptoms of one ‘functional elimination disorder’? - Bael, An M.; Benninga, Marc A.; Lax, Hildegard; Bachmann, Hannsjörg; Janhsen, Ellen; De Jong, Tom P.V.M.; Vijverberg, Marianne; Van Gool, Jan D. (BJU International, 2007)