Most women with breast cancer about to initiate aromatase inhibitors already have bone loss R. Hernández San Gil; E.M. Rodríguez Rodríguez; L.M. Rodríguez Rodríguez; H. Roldán Delgado; J. Cruz Jurado; M.J. Sánchez Pérez; M.J. de la Vega Prieto; L.S. Medina Vega; M.A. Gómez Rodríguez-Bethencourt; J. Oramas Rodríguez; B.E. Alonso Álvarez; J.N. Batista López;