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Edelman, D. A., and Brenner, W. E.: Am. J. Obstet. Gynecol. (In press)
- Int. J. Gynecol. Obstet. 1971; 9: 3
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- Studies Family Plan. 1972; 3: 97
☆This work was supported in part by the Agency for International Development (AID/cds 2979).