1. Department of Surgery, College of Medicine The Pennsylvania State University Hershey Pennsylvania USA
2. Division of Outcomes Research and Quality, Department of Surgery Penn State Hershey Medical Center Hershey Pennsylvania USA
3. Division of Health Services and Behavioral Research, Department of Public Health Sciences Penn State College of Medicine Hershey Pennsylvania USA
4. Division of Surgical Oncology, Department of Surgery Penn State Hershey Medical Center Hershey Pennsylvania USA