[1] Univ Coimbra, Fac Pharm, Ctr Neurosci, P-3000 Coimbra, Portugal
[2] Swiss Fed Inst Technol, Brain Mind Inst, CH-1015 Lausanne, Switzerland
[3] CEA, Inst Biomed Imaging MIRCen, Saclay, France
[4] Albany Med Coll, VA Med Ctr, Dept Neurol, Albany, NY 12208 USA