1. Department of Clinical Sciences, Division of Experimental Vascular Research; Lund University; SE-22184 Lund Sweden
2. Department of Neuroscience; Merck Research Laboratories; West Point Pennsylvania 19486
3. Department of Imaging; Merck Research Laboratories; West Point Pennsylvania 19486
4. Department of Pain and Migraine Research; Merck Research Laboratories; West Point Pennsylvania 19486