Irritable bowel, chronic widespread pain, chronic fatigue and related syndromes are prevalent and highly overlapping in the general population: DanFunD. - Petersen, Marie Weinreich; Schröder, Andreas; Jørgensen, Torben; Ørnbøl, Eva; Meinertz Dantoft, Thomas; Eliasen, Marie; Benros, Michael Eriksen; Fink, Per (Scientific Reports, 2020)