Familial lower esophageal rings.
D000328:Adult; D000368:Aged; D003680:Deglutition Disorders / Q000235:genetics*; D004200:Diseases in Twins; D004947:Esophagus / Q000002:abnormalities*; D005260:Female; D005764:Gastroesophageal Reflux / Q000235:genetics*; D006548:Hernia, Diaphragmatic / Q000235:genetics*; D006551:Hernia, Hiatal / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged