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Are early human chorionic gonadotropin levels after methotr..:

Nguyen, Quyen ; Kapitz, Martha ; Downes, Katheryne.
American Journal of Obstetrics and Gynecology.  202 (2010)  6 - p. 630.e1-630.e5 , 2010
Link: https://doi.org/10.1016/j.ajog.2010.03.022