| Literature DB >> 4720531 |
A J Tyack, R J Parsons, D R Millar, G Pennington, R Hall.
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Year: 1973 PMID： 4720531 DOI： 10.1111/j.1471-0528.1973.tb15979.x
Source DB: PubMed Journal: J Obstet Gynaecol Br Commonw ISSN： 0022-3204