1. Department of Public Health Sciences, College of Medicine, The Pennsylvania State University, Hershey, PA 17033, USA
2. Penn State Cancer Institute, Hershey, PA 17033, USA
3. Department of Geography, College of Earth and Mineral Sciences, University Park, The Pennsylvania State University, State College, PA 16801, USA
4. Department of Family and Community Medicine, College of Medicine, The Pennsylvania State University, Hershey, PA 17033, USA
5. Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, OH 44106, USA