El-Sakka A, Morsy A, Fagih B (May 2007). "Enhanced External Counterpulsation in Patients with Coronary Artery Disease-Associated Erectile Dysfunction. Part I: Effects of Risk Factors". The Journal of Sexual Medicine. 4 (3): 771–779. doi:10.1111/j.1743-6109.2007.00458.x. PMID17433083.
El-Sakka A, Morsy A, Fagih B (May 2007). "Enhanced External Counterpulsation in Patients with Coronary Artery Disease-Associated Erectile Dysfunction. Part I: Effects of Risk Factors". The Journal of Sexual Medicine. 4 (3): 771–779. doi:10.1111/j.1743-6109.2007.00458.x. PMID17433083.