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Review
. 1997 Jul;90(7):379-86.
doi: 10.1177/014107689709000706.

Assembling comparison groups to assess the effects of health care

I Chalmers  1
Affiliations
Review

Assembling comparison groups to assess the effects of health care

I Chalmers. J R Soc Med. 1997 Jul.
No abstract available

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References

    1. JAMA. 1981 Nov 27;246(21):2455-9 - PubMed
    1. Br Med J. 1963 Apr 20;1(5337):1043-9 - PubMed
    1. Pediatrics. 1984 Nov;74(5):842-9 - PubMed
    1. J Clin Oncol. 1986 Oct;4(10):1529-41 - PubMed
    1. Control Clin Trials. 1986 Dec;7(4):306-24 - PubMed