[1] Erasmus MC Sophia Childrens Hosp, Dept Pediat Surg, Rotterdam, Netherlands
[2] Erasmus MC Sophia Childrens Hosp, Pediat Intens Care Unit, Rotterdam, Netherlands
[3] Karolinska Inst, Dept Womens & Childrens Hlth, Stockholm, Sweden
[4] European Pediat Surg Audit, Dutch Inst Clin Auditing, Leiden, Netherlands
[5] Univ Hosp La Paz, Dept Pediat Surg, Madrid, Spain
[6] Necker Enfants Malad Hosp, Dept Pediat Gastroenterol Hepatol & Nutr, Paris, France
[7] Univ Hosp Padua, Dept Pediat Surg, Dept Womens & Childrens Hlth, Padua, Italy
[8] Radboudumc Amalia Childrens Hosp, Dept Surg, Div Pediat Surg, Nijmegen, Netherlands
[9] Oslo Univ Hosp, Dept Pediat Surg, Oslo, Norway
[10] Univ Oslo, Oslo, Norway
[11] Emma Childrens Hosp, Acad Med Ctr, Dept Pediat Gastroenterol & Nutr, Amsterdam, Netherlands
[12] Univ Southern Denmark, Odense Univ Hosp, Res Unit Surg, Odense, Denmark
[13] Helsinki Univ Cent Hosp, Dept Paediat Surg, Helsinki, Finland
[14] German Patient Support Org Anorectal Malformat &, SoMA, Munich, Germany
[15] Univ Hosp Frankfurt, Dept Paediat Surg & Paediat Urol, Frankfurt, Germany
[16] Dutch Hirschsprungs Dis Assoc, Lyon, France
[17] St Antonio & Biagio & Cesare Arrigo Hosp, Unit Pediat Surg, Alessandria, Italy