2009 May 22 ~ 23 40th KSUM Annual Congress and Exhibition, Seoul Korea June 5 ~ 6 the 2nd Asian Congress of Abdominal Radiology 2009, Seoul Korea Aug.30 ~ Sep.3 12th World Congress of the World Federation for Ultrasound in Medicine and Biology, Sydney, Australia 2010 May 14 ~ 15 41st KSUM Annual Congress and Exhibition, Seoul Korea