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Epidemiology of functional gastrointestinal disorders in infants and toddlers: A systematic review. World J Gastroenterol 2016;22(28):6547. 7. Benninga MA, Faure C, Hyman PE, St James Roberts I, Schechter NL, Nurko S. Childhood Functional Gastrointestinal Disorders: Neonate/Toddler. Gastroenterology 2016;150(6):1443–55. 8. Koppen IJN, Nurko S, Saps M, Di Lorenzo C, Benninga MA. The pediatric Rome IV criteria: what’s new? Expert Rev Gastroenterol Hepatol 2017;11(3):193–201. 9. Phatak UP, Pashankar DS. Prevalence of functional gastrointestinal disorders in obese and overweight children. Int J Obes (Lond) 2014;38(10):1324–7. 10. Pashankar DS, Loening-Baucke V. Increased Prevalence of Obesity in Children With Functional Constipation Evaluated in an Academic Medical Center. Pediatrics 2005;116(3):e377–80. 11. Misra S, Lee A, Gensel K. Chronic constipation in overweight children. JPEN J Parenter Enteral Nutr 2006;30(2):81–4. 12. vdBaan-SlootwegOH,LiemO,BekkaliN,etal.Constipation and colonic transit times in children with morbid obesity. J Pediatr Gastroenterol Nutr 2011;52(4):442–5. 13. Fishman L, Lenders C, Fortunato C, Noonan C, Nurko S. Increased prevalence of constipation and fecal soiling in a population of obese children. J Pediatr 2004;145(2):253–4. 14. Niemczyk J, Equit M, Braun-Bither K, Klein A-M, von Gontard A. Prevalence of incontinence, attention deficit/ hyperactivity disorder and oppositional defiant disorder in preschool children. Eur Child Adolesc Psychiatry 2015;24(7):837–43. 15. Niemczyk J, Equit M, Hoffmann L, von Gontard A. Incontinence in children with treated attention-deficit/ hyperactivity disorder. J Pediatr Urol 2015;11(3):141.e1-6. 16. McKeown C, Hisle-Gorman E, Eide M, Gorman GH, Nylund CM. Association of constipation and fecal incontinence with attention-deficit/hyperactivity disorder. Pediatrics 2013;132(5):e1210-5. 17. 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Amsterdam infant stool scale is more useful for assessing children who have not been toilet trained than Bristol stool scale. Acta Paediatr 2014;103(2):e91-2. 24. Kuizenga-Wessel S, Heckert SL, Tros W, van Etten- Jamaludin FS, Benninga MA, Tabbers MM. Reporting on Outcome Measures of Functional Constipation in Children - A Systematic Review. J Pediatr Gastroenterol Nutr 2016;62(6):840–6. 25. Kuizenga-Wessel S, Benninga MA, Tabbers MM. Reporting outcome measures of functional constipation in children from 0 to 4 years of age. J Pediatr Gastroenterol Nutr 2015;60(4):446–56. 26. Kuizenga-Wessel S, Steutel NF, Benninga MA, et al. Development of a core outcome set for clinical trials in childhood constipation: a study using a Delphi technique. BMJ Paediatr Open 2017;0:e000017. 27. Vriesman MH, Velasco-Benítez CA, Ramirez CR, Benninga MA, Di Lorenzo C, Saps M. 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