title: A case of quadricuspid aortic valve with aortic regurgitation.
authors: Division of Cardiology, Department of Internal Medicine, Wonju College of Medicine, Yonsei University, Wonju, Korea.
authors: Young Jin
authors: YJ
authors: Youn
authors: Jang-Young
authors: JY
authors: Kim
authors: Sang Woo
authors: SW
authors: Harn
authors: Jun-Won
authors: JW
authors: Lee
authors: Jung-Kyung
authors: JK
authors: Sung
authors: Sung-Gyun
authors: SG
authors: Ahn
authors: Byung-Soo
authors: BS
authors: You
authors: Seung-Hwan
authors: SH
authors: Lee
authors: Junghan
authors: J
authors: Yoon
authors: Kyung-Hoon
authors: KH
authors: Choe