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. 1950 Oct;4(4):221–233. doi: 10.1136/jech.4.4.221
Observations on all Births (23,970) in Birmingham, 1947
I. Duration of Gestation *
J R Gibson
1, Thomas McKeown
1
Thomas McKeown
1Department of Social Medicine, University of Birmingham
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1Department of Social Medicine, University of Birmingham
*
This research was assisted by a grant from the Birmingham University Students' Social Services Fund.
PMCID: PMC1037262 PMID: 14791955