1. Pennington Biomedical Research Center; Louisiana State University System; Baton Rouge LA 70808 USA
2. Department of Coenzyme Biochemistry, Palladin Institute of Biochemistry; National Academy of Sciences of Ukraine; Kiev Ukraine
3. Department of Veterans Affairs; Iowa City VA Health Care System; Iowa City IA 52246 USA
4. Department of Chemistry; Princeton University; Princeton NJ 08544 USA
5. Department of Internal Medicine; University of Iowa; Iowa City IA 52246 USA