1 Assistant Professor, Health Education and Promotion, Environmental Health Sciences Program, East Carolina University, Greenville, NC, USA.
2 Director, Geographic Information Systems and Spatial Analysis laboratory, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, IL, USA.
3 Assistant Professor, Medical and Veterinary Entomology, University of Tennessee, Knoxville, TN, USA.
4 Associate Professor, Department of Biology, University of Texas-Pan American, Edinburg, TX, USA.