1. Department of Surgery; University of California San Diego Health System; San Diego California
2. Rebecca and John Moores Cancer Center; University of California San Diego Health System; San Diego California
3. Department of Colorectal Surgery; Kaohsiung Chang Gung Memorial Hospital; Chang Gung University College of Medicine; Kaohsiung Taiwan
4. Department of Pathology; School of Medicine; University of California; San Diego California
5. Division of Biostatistics and Bioinformatics; School of Medicine; University of California; San Diego California