1. Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Sección de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, México DF, México
3. Institute of Analytical Chemistry of the ASCR, v.v.i., Prague, Czech Republic
4. Department of Nutrition, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
5. Facultad de Medicina, Universidad Juárez del Estado de Durango, Gómez Palacio, Durango, México
6. Pharmacokinetics Branch, Experimental Toxicology Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA