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. 1901 May;55(5):370–385.

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Obstetrical and Gynæcological Society

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits non-commercial use and redistribution provided that the original author and source are credited.

PMC Copyright notice

PMCID: PMC5949652 PMID: 30436838

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