1. Department of Pathology, Rhode Island Hospital, The Warren Alpert Medical School at Brown University, Providence, RI 02908, USA
2. Division of Colon and Rectal Surgery, Robert Wood Johnson Medical School, Cooper University Hospital, University of Medicine and Dentistry of New Jersey, Camden, NJ 07103, USA
3. Division of Colorectal Surgery, Rhode Island Hospital, The Warren Alpert Medical School at Brown University, Providence, RI 02908, USA