Long-term use of proton pump inhibitors and vitamin B12 status in elderly individuals.
den Elzen WP; Groeneveld Y; de Ruijter W; Souverijn JH; le Cessie S; Assendelft WJ; Gussekloo J; Alimentary Pharmacology & Therapeutics, 2008, vol. 27, issue 6, p 491, ISSN 13652036. ISBN 13652036.

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