title: Pregnancy and the lower esophageal sphincter.
mesh_terms: D004943:Esophagogastric Junction / Q000502:physiology* / Q000503:physiopathology; D004967:Estrogens / Q000097:blood; D005260:Female; D006356:Heartburn / Q000503:physiopathology*; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000503:physiopathology*; D011312:Pressure; D011374:Progesterone / Q000097:blood
chemical_list: D004967:Estrogens; D011374:Progesterone