Selection of controls-always a challenge: Reply of the authors:

Author: van Montfrans J.M.   Hoek A.   van Hooff M.H.A.   Lambalk C.B.  

Publisher: Elsevier

ISSN: 0015-0282

Source: Fertility and Sterility, Vol.75, Iss.4, 2001-04, pp. : 836-837

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Abstract