esophageal dysmotility treatmentscleroderma esophageal dysmotilityesophageal dysmotility disordermoderate esophageal dysmotilitysevere esophageal dysmotilityesophageal dysmotility syndromedistal esophageal dysmotilitydysmotility oesophagusesophagus esophagitisesophageal carcinoma treatmentesophageal endoscopymild hyperkalemia treatment