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137: Changes in maternal mortality ratio in the us over four decades:associations with abortive pregnancy
- Source :
- American Journal of Obstetrics and Gynecology. 222:S103
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
Details
- ISSN :
- 00029378
- Volume :
- 222
- Database :
- OpenAIRE
- Journal :
- American Journal of Obstetrics and Gynecology
- Accession number :
- edsair.doi...........a1588ebb9201cac3f372320da6e577a6