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Efficacy of oral compared with intramuscular vitamin B 12 supplementation after Roux en Y gastric bypass: a randomized controlled trial ScienceDirect The Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 Deficiency: Recognition and Management AFP Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta analysis Irish Journal of Medical Science (1971 )
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