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Institution: CLOCKSS  | My Account | E-mail Alerts | Access Rights | Sign In Vol. 4 No. 4, April 1995   Archives  •  Online Features Letters to the Editor  This Article  • Excerpt  • Full text PDF  • Send to a friend  • Save in My Folder  • Save to citation manager  • Permissions  Citing Articles  • Contact me when this article is cited  Related Content  • Similar articles in this journal Screening for Cobalamin Deficiency-Reply Yulin Yao, MD Arch Fam Med. 1995;4(4):305. References Article references have been provided for searching and linking. Additional reference information may be available in the article PDF. 1. Pennypacker LC, Allen RH, Kelly JP, et al. High prevalence of cobalamin deficiency in elderly outpatients. J Am Geriatr Soc. 1992;40:1197-1204. PUBMED 2. Norman EJ, Morrison JA. Screening elderly populations for cobalamin deficiency using the urinary methylmalonic acid assay by gas chromatography mass spectrometry. Am J Med. 1993;94:589-594. PUBMED