title: Pernicious anaemia as a cause of infertility in twins.
mesh_terms: D000328:Adult; D000748:Anemia, Macrocytic / Q000150:complications; D000752:Anemia, Pernicious / Q000150:complications* / Q000235:genetics; D001772:Blood Cell Count; D001789:Blood Group Antigens; D001799:Blood Sedimentation; D004200:Diseases in Twins; D006801:Humans
chemical_list: D001789:Blood Group Antigens