1. Department of Cardiology and Clinical Pharmacology, Georgetown University Medical Center, Washington, DC
2. Vanderbilt University School of Medicine, Nashville, Tennessee
3. Allergy and Clinical Immunology Service, Department of Internal Medicine, University of Genoa, Genoa, Italy
4. Southampton General Hospital, Southampton, United Kingdom
5. Department of Pharmacology, Georgetown University Medical Center, Washington, DC
6. Fondazione Salvatore, Pavia, Italy
7. Schering-Plough Research Institute, Milan, Italy
8. Clinical Pharmacology, Schering-Plough Research Institute, Kenilworth, New Jersey