1. Mel and Enid Zuckerman College of Public Health; Department of Health Promotion Sciences; University of Arizona; Tucson 85724 AZ, USA
2. College of Medicine; Department of Medicine; University of Arizona; Tucson 85724 AZ, USA
3. School of Medicine; Department of Pharmacology; Vanderbilt University; Nashville 37232 TN, USA
4. Mel and Enid Zuckerman College of Public Health; Department of Epidemiology and Biostatistics