1. Gastrointestinal Cancer Center, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.
2. Department of Internal Medicine, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.
3. Department of Pathology, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.
4. Department of Hemato-oncology, Dongnam Institute of Radiological & Medical Sciences, Busan, Korea.