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. 1901 Jun;55(6):439–452.

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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: PMC5949669 PMID: 30436849

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