The old pregnancy calendar as a new invention

详细

The author complements the article by R. Nickel, which appeared in No. 37 Cntrbl. f. Gyn. and indicating that the pregnancy calendar published in the American Journal of obstetrics (November 1889) and in the Archives de tocologie (May 1890) is far from new, as he found it in one of the Prussian textbooks published in 1838 or 1840

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