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. 1994 Aug 20;309(6953):540. doi: 10.1136/bmj.309.6953.540a

Experimental and observational methods of evaluation.

PMCID: PMC2542748 PMID: 8086926

540

Selected References

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

Sheldon T. A. Please bypass the PORT. BMJ. 1994 Jul 16;309(6948):142–143. doi: 10.1136/bmj.309.6948.142. [DOI] [PMC free article] [PubMed] [Google Scholar]

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