First trimester serum levels of 25-hydroxyvitamin D, free β-human chorionic gonadotropin, and pregnancy-associated plasma protein A in Spanish women

Author: Fernández-alonso Ana M.   Valdera-simbrón Carlos J.   Fiol-Ruiz Gabriel   Rodríguez-sánchez Firma   Chedraui Peter   Pérez-lópez Faustino R.  

Publisher: Informa Healthcare

ISSN: 1473-0766

Source: Gynecological Endocrinology, Vol.27, Iss.12, 2011-12, pp. : 1061-1064

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