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letter

. 1996 Dec 14;313(7071):1551–1552. doi: 10.1136/bmj.313.7071.1551c

Postal surveys in general practice. More analytical studies should be carried out.

PMCID: PMC2353081 PMID: 8978252

Selected References

These references are in PubMed. This may not be the complete list of references from this article.

Black N. Why we need observational studies to evaluate the effectiveness of health care. BMJ. 1996 May 11;312(7040):1215–1218. doi: 10.1136/bmj.312.7040.1215. [DOI] [PMC free article] [PubMed] [Google Scholar]
McAvoy B. R., Kaner E. F. General practice postal surveys: a questionnaire too far? BMJ. 1996 Sep 21;313(7059):732–734. doi: 10.1136/bmj.313.7059.732. [DOI] [PMC free article] [PubMed] [Google Scholar]

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