1. Seifert B, Rubin G, de Wit N, Lionis C, Hall N, Hungin P, et al. The management of common gastrointestinal disorders in general practice a survey by the European society for primary care gastroenterology (ESPCG) in six European countries. Dig Liver Dis. 2008 Aug;40(8):659–66.
2. Mugie SM, Benninga MA, Di Lorenzo C. Epidemiology of constipation in children and adults: a systematic review. Best Pract Res Clin Gastroenterol. 2011 Feb;25(1):3–18.
3. Johanson JF, Kralstein J. Chronic constipation: a survey of the patient perspective. Aliment Pharmacol Ther. 2007 Mar 1;25(5):599–608.
4. Drossman DA, Hasler WL. Rome IV-functional GI disorders: disorders of gut-brain interaction. Gastroenterology. 2016 May;150(6):1257–61.
5. Aziz I, Whitehead WE, Palsson OS, Törnblom H, Simrén M. An approach to the diagnosis and management of Rome IV functional disorders of chronic constipation. Expert Rev Gastroenterol Hepatol. 2020 Jan;14(1):39–46.