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Metformin and Vitamin B12 Deficiency: Association and Not Causation May Play a Major Role in Cohort Studies—Reply
Kai Ming Chow, MRCP, Rose Zhao-Wei Ting, MBBS, Cheuk Chun Szeto, FRCP, MD
Arch Intern Med. 2007;167(7):730-731.
Published online April 9, 2007

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