1. Department of Surgery and College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania, USA.
2. Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania, USA.
3. College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania, USA.
4. Department of Family and Community Medicine, College of Medicine, The Pennsylvania State University, Hershey, Pennsylvania, USA.