[1] UCL INST NEUROL, DEPT CLIN NEUROL, LONDON, ENGLAND
[2] UNIV BASEL, KANTONSSPITAL BASEL, DEPT NEUROL, CH-4051 BASEL, SWITZERLAND
[3] FREE UNIV AMSTERDAM HOSP, DEPT THEORY MED EPIDEMIOL & BIOSTAT, AMSTERDAM, NETHERLANDS
[4] KLINIKUM GROSSHADERN, RADIOL KLIN & POLIKLIN, MUNICH, GERMANY
[5] IST SCI H S RAFAELLE, DEPT NEURORADIOL, MILAN, ITALY
[6] ACAD HOSP MIDDELHEIM, DEPT NEURORADIOL, ANTWERP, BELGIUM
[7] UNIV TOULOUSE, PURPAN HOSP, DEPT NEURORADIOL, TOULOUSE, FRANCE
[8] UNIV TOULOUSE, PURPAN HOSP, DEPT NUCL MED, TOULOUSE, FRANCE
[9] UNIV TOULOUSE, RANGEUIL HOSP, DEPT NEURORADIOL, TOULOUSE, FRANCE
[10] UNIV TOULOUSE, RANGEUIL HOSP, DEPT NUCL MED, TOULOUSE, FRANCE