Referenze
Rosen RC et al. The international index of erectile function (IIEF) a multidimensional scale for assessment of erectile dysfunction. Urology. 1997 Jun; 49(6):822-30. Copyright 1997 by Elsevier Science, Inc.
Rosen RC et al. Development and evaluation of an abridged 5-item version of the International Index of Erectile Function (IIEF-5) as a diagnostic tool for erectile dysfunction. Int J Impotence Res 1999; 11: 319 – 326.