scleroderma esophageal dysmotilityesophageal dysmotility disordermoderate esophageal dysmotilitysevere esophageal dysmotilityesophageal dysmotility syndromedistal esophageal dysmotilitymild esophageal dysmotilitydysmotility oesophagusesophagus dysmotilityesophageal dysphagiaesophagus esophagitisesophageal inflammation treatment