1. Dartmouth Cancer Center, Lebanon, New Hampshire, USA.
2. Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA.
3. Department of Geography and Anthropology, Pinkie Gordon Lane Graduate School, Louisiana State University, Baton Rouge, Louisiana, USA.
4. Department of Population Health Sciences, University of Utah and Huntsman Cancer Institute, Salt Lake City, Utah, USA.