[1] GEN INFIRM,DEPT ANAESTHET,LEEDS LS1 3EX,W YORKSHIRE,ENGLAND
[2] SO GEN HOSP,INST NEUROL SCI,DEPT NEUROSURG,GLASGOW G51 4TF,LANARK,SCOTLAND
[3] HOP PELLEGRIN,DEPT NEUROSURG,F-33076 BORDEAUX,FRANCE
[4] SOUTHAMPTON GEN HOSP,DEPT NEUROSURG,SOUTHAMPTON SO9 4XY,HANTS,ENGLAND
[5] UNIV COLOGNE,NEUROCHIRURG KLIN,COLOGNE,GERMANY
[6] HOP JEAN BERNARD,SERV NEUROCHIRURG,POITIERS,FRANCE
[7] UNIV EDINBURGH,SCH MED,MED STAT UNIT,EDINBURGH,MIDLOTHIAN,SCOTLAND
[8] UNIV HELSINKI,CENT HOSP,DEPT NEUROSURG,HELSINKI,FINLAND
[9] AKAD HOSP,DEPT NEUROSURG,UPPSALA,SWEDEN
[10] PAD BERETTA NEURO OSPED POLICLIN,MILAN,ITALY
[11] HUMBOLDT UNIV BERLIN,KLINIKUM RUDOLF VIRCHOW,FAK MED,DEPT NEUROSURG,BERLIN,GERMANY
[12] OSPED GEN PROVINCIALE M BUFALINI,CESENA SOCCORSO,CESENA,FO,ITALY