Do-Young Kwon1, Jinhee Kim2, HoKyong Yoon3, Moon Ho Park2. 1. Korea University College of Medicine, Ansan Hospital, Ansan-city, 15355, Gyeonggi-do, Republic of Korea. kwondoya@hanmail.net. 2. Korea University College of Medicine, Ansan Hospital, Ansan-city, 15355, Gyeonggi-do, Republic of Korea. 3. Department of Psychiatry, Korea University Ansan Hospital, Ansan, Republic of Korea.