1. Department of Family & Community Medicine, College of Medicine, University of Arizona, Tucson, USA
2. Department of Health Promotion Sciences, Mel & Enid Zuckerman College of Public Health, University of Arizona, Tucson, USA
3. University of Arizona Cancer Center, Tucson, USA
4. Department of Epidemiology & Biostatistics, Mel & Enid Zuckerman College of Public Health, University of Arizona, Tucson, USA