[Irritable Bowel Syndrome: German Consensus Guidelines on Definition, Pathophysiology and Management. German Society of Digestive and Metabolic Diseases (DGVS) and German Society of Neurogastroenterology and Motility (DGNM)]. Z Gastroenterol 2011; 49: 237–293 Updated version (June 2021). Available: https://www.awmf.org/uploads/tx_szleitlinien/021-016l_S3_Definition-Pathophysiologie-Diagnostik-Therapie-Reizdarmsyndroms_2021-07.pdf, last access: 12th December 2021. - Layer, P; Andresen, V; Pehl, C
et al.