1. Koppen IJ, Lammers LA, Benninga MA, Tabbers MM. Management of functional constipation in children: therapy in practice. Paediatr Drugs. 2015; 17:349–360.
2. Çengel-Kültür SE, Akdemir D, Saltık-Temizel İN. Comparison of familial and psychological factors in groups of encopresis patients with constipation and without constipation. Turk J Pediatr. 2014; 56:524–531.
3. Kim HY, Kwon EB, Baek JH, Shin YH, Yum HY, Jee HM, Yoon JW, Han MY. Prevalence and comorbidity of allergic diseases in preschool children. Korean J Pediatr. 2013; 56:338–342.
4. Torres MR, de Melo MC, Purcino FA, Maia JC, Aliani NA, Rocha HC. Knowledge and practices of pediatricians regarding functional constipation in the State of Minas Gerais, Brazil. J Pediatr Gastroenterol Nutr. 2015; 61:74–79.
5. Hyman PE, Milla PJ, Benninga MA, Davidson GP, Fleisher DF, Taminiau J. Childhood functional gastrointestinal disorders: neonate/toddler. Gastroenterology. 2006; 130:1519–1526.
6. Rasquin A, Di Lorenzo C, Forbes D, Guiraldes E, Hyams JS, Staiano A, Walker LS. Childhood functional gastrointestinal disorders: child/adolescent. Gastroenterology. 2006; 130:1527–1537.
7. Nurko S, Zimmerman LA. Evaluation and treatment of constipation in children and adolescents. Am Fam Physician. 2014; 90:82–90.
8. Tabbers MM, DiLorenzo C, Berger MY, Faure C, Langendam MW, Nurko S, Staiano A, Vandenplas Y, Benninga MA; European Society for Pediatric Gastroenterology, Hepatology, and Nutrition. Evaluation and treatment of functional constipation in infants and children: evidence-based recommendations from ESPGHAN and NASPGHAN. J Pediatr Gastroenterol Nutr. 2014; 58:258–274.
9. Turco R, Miele E, Russo M, Mastroianni R, Lavorgna A, Paludetto R, Pensabene L, Greco L, Campanozzi A, Borrelli O, et al. Early-life factors associated with pediatric functional constipation. J Pediatr Gastroenterol Nutr. 2014; 58:307–312.
10. Nemes S, Jonasson JM, Genell A, Steineck G. Bias in odds ratios by logistic regression modelling and sample size. BMC Med Res Methodol. 2009; 9:56.
11. Vandell DL, Belsky J, Burchinal M, Steinberg L, Vandergrift N; NICHD Early Child Care Research Network. Do effects of early child care extend to age 15 years? Results from the NICHD study of early child care and youth development. Child Dev. 2010; 81:737–756.
12. Belsky J, Pluess M. Genetic moderation of early child-care effects on social functioning across childhood: a developmental analysis. Child Dev. 2013; 84:1209–1225.
13. Tabbers MM, Boluyt N, Berger MY, Benninga MA. Nonpharmacologic treatments for childhood constipation: systematic review. Pediatrics. 2011; 128:753–761.
14. Chang SH, Park KY, Kang SK, Kang KS, Na SY, Yang HR, Uhm JH, Ryoo E. Prevalence, clinical characteristics, and management of functional constipation at pediatric gastroenterology clinics. J Korean Med Sci. 2013; 28:1356–1361.