| Literature DB >> 4712942 |
R M Ballard, P J Bradley-Watson, F D Johnstone, A Kenney, T G McCarthy.
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Year: 1973 PMID: 4712942 DOI: 10.1111/j.1471-0528.1973.tb15963.x
Source DB: PubMed Journal: J Obstet Gynaecol Br Commonw ISSN: 0022-3204