A Digenic Combination of Polymorphisms Within ESR1 and ESR2 Genes Are Associated With Age at Menarche in the Spanish Population. - Mendoza, Nicolás; Morón, Francisco Jesús; Quereda, Francisco; Vázquez, Francisco; Rivero, Mari C.; Martínez-Astorquiza, Txantón; Real, Luis M.; Sánchez-Borrego, Rafael; González-Pérez, Antonio; Ruiz, Agustín (Reproductive Sciences, 2008)