Dr. JI. Choi, MD, PhD, graduated from the Korea University College of Medicine, Seoul, in 1998. He accomplished the training at Korea University Medical Center and certified qualifications in the internal medicine, cardiology and cardiac electrophysiology. He finished the PhD at the Korea University in 2008. He was nominated an Assistant Professor of Internal Medicine, Korea University, in 2007. He has been nominated an Associate Professor of Internal Medicine, Korea University, since 2012. He is working in Seoul, Korea at the Division of Cardiology, Cardiovascular Center of Korea University Medical Center. He is a member of Korea Heart Rhythm Society and Asia Pacific Heart Rhythm Society.