1. IBMP-Institute for Biomedical and Pharmaceutical Research, 90562 Nürnberg-Heroldsberg,1
2. Institute for Clinical Pharmacology, University Hospital, 60590 Frankfurt am Main,2
3. Institute for Pharmacology of the University, Clinical Pharmacology, 50924 Cologne,3 and
4. Mediolanum Farmaceutici, Milan, Italy4
5. Institute of Pharmacology, University of Essen, Essen,5 Germany, and