A. Cocci, A. Romano, G. Morelli, D. Frediani, A. Sodi, and G. I. Russo, “Erectile disfunction medical treatment with phosphodiesterase 5 inhibitors (PDE5i) in patients with retinitis pigmentosa and side effects”, Arch Ital Urol Androl, vol. 92, no. 4, Dec. 2020.