1. Dipartimento di Scienza e Tecnologia del Farmaco, via Giuria 9, 10125 Torino, Italy
2. Dipartimento di Chimica Organica e Industriale, via Venezian 21, 20133 Milano, Italy
3. Division of Pharmacology, Department of Physiology and Pharmacology, Karolinska Institute, 171 77 Stockholm, Sweden