1. Department of Psychology, Faculty of Medicine and Psychology, University of Rome Sapienza, Roma, Lazio, Italy
2. Umberto Bosio Center for Digestive Diseases, The Children Hospital - AO SS Antonio e Biagio e Cesare Arrigo, Alessandria, Piedmont, Italy
3. Department of Pediatric Urology, Radboud Universiteit Nijmegen, Nijmegen, Gelderland, the Netherlands
4. Department of Pediatric Surgery, Erasmus MC Sophia, Rotterdam, the Netherlands
5. SoMA e.V. - Patient Organization, Munich, Germany
6. Department of Biology, University of Florence, Italian Patient's Organization for Hirschsprung Disease (AMHORI), Firenze, Toscana, Italy
7. Italian Patient's Organization for ARM (AIMAR) - Patient Organization, Via Nomentana, Rome, Italy