Prevalence and Clinical Significance of Discordant Changes in Fractional and Coronary Flow Reserve After Elective Percutaneous Coronary Intervention oleh Junji Matsuda, Tadashi Murai, Yoshihisa Kanaji, Eisuke Usui, Makoto Araki, Takayuki Niida, Sadamitsu Ichijyo, Rikuta Hamaya, Tetsumin Lee, Taishi Yonetsu, Mitsuaki Isobe, Tsunekazu Kakuta