Assertion: hemolytic anemia's cause | /r/HasProperty | pernicious anemia
Facets:
Source sentences:
text: The most common cause of vitamin B12 deficiency is pernicious anemia, which is autoimmune-mediated destruction of the parietal cells of the stomach that decreases the production of hydrochloric acid and intrinsic factor, both of which are needed for absorption of vitamin B12.