1. Division of Surgical Oncology; Department of Surgery; University of Nebraska Medical Center; Omaha Nebraska
2. College of Medicine; University of Nebraska Medical Center; Omaha Nebraska
3. Department of Surgery; Gundersen Medical Foundation; La Crosse Wisconsin
4. College of Public Health; University of Nebraska Medical Center; Omaha Nebraska
5. School of Public Health; Shanghai Jiao Tong University; Shanghai, P.R. China
6. Department of Hepatobiliary Tumor; Tianjin Medical University Cancer Institute and Hospital; Tianjin, P.R. China
7. Section of Gastroenterology; Department of Medicine; Boston University Medical Center; Boston Massachusetts