Oral L-citrulline and Transresveratrol Supplementation Improves Erectile Function in Men With Phosphodiesterase 5 Inhibitors: A Randomized, Double-Blind, Placebo-Controlled Crossov... oleh Masato Shirai, MD, PhD, Ippei Hiramatsu, MD, Yusuke Aoki, MD, Hirofumi Shimoyama, MD, PhD, Taiki Mizuno, MD, PhD, Taiji Nozaki, MD, PhD, Shinichiro Fukuhara, MD, PhD, Atsushi Iwasa, MD, PhD, Shinji Kageyama, MD, PhD, Akira Tsujimura, MD, PhD