[1] UCL Inst Neurol, Dept Clin & Expt Epilepsy, London WC1N 3BG, England
[2] Univ Manchester, Inst Populat Hlth, Wolfson Mol Imaging Ctr, MAHSC, Manchester, Lancs, England
[3] Epilepsy Soc, Gerrards Cross, Bucks, England
[4] Med Univ Vienna, Dept Clin Pharmacol, A-1090 Vienna, Austria
[5] Austrian Inst Technol, Hlth & Environm Dept, Seibersdorf, Austria
[6] PET Res Advisory Co, Wilmslow, Cheshire, England