1. Department of Biomedical Informatics, University of Arkansas for Medical Sciences, 4301 W. Markham St., Little Rock, Arkansas 72205, United States
2. Winthrop P. Rockefeller Cancer Institute, University of Arkansas for Medical Sciences, 4301 W. Markham St., Little Rock, Arkansas 72205, United States
3. Department of Chemistry, University of California, Riverside 501 Big Springs Road, Riverside, California 92521-0403, United States
4. Environmental and Occupational Health, University of Arkansas for Medical Sciences, 4301 W. Markham St., Little Rock, Arkansas 72205, United States