Optimizing hCG cut-off values: A single determination on day 14 or 15 is sufficient for a reliable prediction of pregnancy outcome by Lambers, Marieke J., van Weering, Hans G.I., van’t Grunewold, Maud S., Lambalk, Cornelis B., Homburg, Roy, Schats, Roel, Hompes, Peter G.A.

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