1. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Pathology and Translational Genomics, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Surgery, Digestive Disease and Surgery Institute, Cleveland Clinic, Cleveland, OH, USA.
4. Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.