1. Frederick H. King Professor of Internal Medicine, Department of Medicine; New York University School of Medicine; 550 First Ave., OBV A-606 New York NY 10016
2. Veterinary Laboratories Agency, New Haw, Addlestone; Surrey KT15 3NB United Kingdom
3. Department of Biochemistry and Molecular Biology; Medical College of Georgia; Augusta GA 30912
4. Institute of Molecular Biosciences, University of Graz, Humboltstraße 50; A-8010 Graz Austria