AB21. Association between vascular evaluation and erection hardness score in the patients with ED - Sasaki, Haruaki; Imamura, Yuichiro; Yamagishi, Motoki; Shimoyama, Hideaki; Yamamoto, Kenro; Ota, Michiya; Ishikawa, Kimiyasu; Hayashi, Keiichiro; Fukagai, Takashi; Iso, Yoshitaka; Suzuki, Hiroshi; Ogawa, Yoshio (Translational Andrology and Urology, 2014)