Comparability of maternal mortality rates in the United States and certain foreign countries
1935 ◽
Vol 29
(4)
◽
pp. 610-612
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1935 ◽
Vol 50
(2)
◽
pp. 566
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2011 ◽
Vol 56
(4)
◽
pp. 404-405
◽
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2020 ◽
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