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Goldstein, I., Jones, L. A., Belkoff, L. H., Karlin, G. S., Bowden, C. H., Peterson, C. A., … Day, W. W. (2012). Avanafil for the Treatment of Erectile Dysfunction: A Multicenter, Randomized, Double-Blind Study in Men With Diabetes Mellitus. Mayo Clinic Proceedings, 87(9), 843–852. doi:10.1016/j.mayocp.2012.06.016 
10.1016/j.mayocp.2012.06.016