1. RTI International, Research Triangle Park NC USA
2. University of Bristol Bristol UK
3. Department of Chemistry University of Colorado Denver USA
4. College of Medicine University of Kentucky Lexington KY USA
5. Health Sciences Center University of New Mexico Albuquerque NM USA
6. Univerisity of California San Francisco CA USA
7. Centers for Disease Control and Prevention Atlanta GA USA
8. Grady Health System Atlanta GA USA