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children study measurement constipation palsy child value dysphagia disability population intake method chapter criteria motor parent technique prevalence factor interrupter technique interrupter problem table gastro-oesophageal reflux rejection resistance centre result function interruption pressure pneumonia risk factors reflux curve research feasibility reference rejection criteria neurol laxative netherland level health pediatr impairment number eur respir j group frequency assessment analysis height inclusion stool gastro-oesophageal sample figure period reproducibility design disorder arch dis child energy treatment information characteristic kinderen definition correlation water consent recording representative airway reference values energy intake defecation difference study design