Yeonyee E. Yoon, Hyun-Jin Kim, Sung-Ai Kim, Seong Hwan Kim, Jae-Hyeong Park, Kyoung-Ha Park, Seonghoon Choi, Min-Kyu Kim, Hyun-Sook Kim, Goo-Yeong Cho

J Cardiovasc Ultrasound.2012;20(3):140-145.   Published online 2012 September 21     DOI: http://dx.doi.org/10.4250/jcu.2012.20.3.140