1. Pharmaron-Beijing Co. Ltd., 6 Taihe Road, BDA, Beijing 100176, P. R. China
2. Small Molecule Research, Pharmaceutical Research and Early Drug Development, Hoffmann-La Roche Inc., 340 Kingsland Street, Nutley, New Jersey 07110, United States
3. Ion Channels Group, Evotec AG, Manfred Eigen Campus, Essener Bogen 7, 22419 Hamburg, Germany