Efficacy and safety of soy isoflavone extract in postmenopausal women: a randomized, double-blind, and placebo-controlled study - Nahas, Eliana Petri [UNESP]; Nahas-Neto, Jorge [UNESP]; Orsatti, Fabio Lera [UNESP]; Carvalho, Eduardo Pessoa [UNESP]; Uemura, Gilberto [UNESP] (Lippincott Williams & Wilkins, 2007)