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Yassin, Dany-Jan; Yassin, Aksam A.; Hammerer, Peter G. . (2014). Combined Testosterone and Vardenafil Treatment for Restoring Erectile Function in Hypogonadal Patients who Failed to Respond to Testosterone Therapy Alone. The Journal of Sexual Medicine, 11(2), 543–552. doi:10.1111/jsm.12378 
10.1111/jsm.12378