| Literature DB >> 1487775 |
P R Williamson1, R C Smith, D E Kern, M Lipkin, L R Barker, R B Hoppe, J Florek.
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Year: 1992 PMID: 1487775 DOI: 10.1007/bf02598023
Source DB: PubMed Journal: J Gen Intern Med ISSN: 0884-8734 Impact factor: 5.128