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Greenfield RH. Oh, to B12 again ... Metformin use and B12 deficiency. Altern Med Alert 2007;10(4):46-47. Greenfield RH. Living with syn: Synbiotics and colon cancer. Altern Med Alert 2007;10(4):47-48. Greenfield RH. Pressure and pain—Analgesic use and blood pressure. Altern Med Alert 2007;10(4):48.

Clinical Briefs With Comments from Russell H. Greenfield, MD