Metformin and vitamin B12 deficiency: association and not causation may play a major role in cohort studies.
Lev
Ishay
I
D015331:Cohort Studies; D006801:Humans; D007004:Hypoglycemic Agents / Q000009:adverse effects*; D008687:Metformin / Q000009:adverse effects*; D013997:Time Factors; D014806:Vitamin B 12 Deficiency / Q000209:etiology*
D007004:Hypoglycemic Agents; D008687:Metformin