Central Office—Mayo Clinic, Rochester Minnesota, USA:

Mayo Clinic, Rochester, Minnesota, USA: D.O. Wiebers, J.P. Whisnant, R.D. Brown, Jr., I. Meissner, D.G. Piepgras, F.B.Meyer, J. Atkinson, W.R. Marsh, J. Huston III, G.S. Forbes, D. Nichols, K. Thielen, L.K. Jaeger.

University Hospital/University of Western Ontario, London, Ontario, Canada: G.G. Ferguson, C.G. Drake, H.W.K. Barr, S.P. Lownie, V.C. Hachinski, A.J. Fox, R.L. Sahjpaul, A.G. Parrent, C. Mayer.

Glasgow University/Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland: K.W. Lindsay, E. Teasdale, I. Bone, J. Fatukasi, M. Lindsay.

University of Virginia, Charlottesville, Virginia: N.F. Kassell, W.S. Cail, Jr., O. Sagher, M. Davis, G. Kongable-Beckman.

The University, Newcastle General Hospital/Regional Neurological Centre, Newcastle Upon Tyne, England: R.P. Sengupta, D. Bates, A. Gholkar, J. Murdy, S. Wilson, S. Praharaj, G. Partridge, C. Reynolds, N. Hind.

Massachusetts General Hospital, Boston, Massachusetts: C. Ogilvy, R. Crowell, D.R. Gress, P. Schaefer, I.S. Choi, D. Buckley, K. Sloan, D. King.

LA County USC Medical Center, Los Angeles, California, USA: S.L. Giannotta, S. Ameriso, G. Teiterbaum, E. Thomson, D. Fishback.

National Institute of Neurosurgery, Budapest Hungary: J. Vajda, I. Nyáry, S. Czirják, M. Horváth, I. Szikora, E. Pásztor, P. Várady, A. Erdos.

Karolinska Hospital, Stockholm, Sweden: G. Edner, N.G. Wahlgren, M. Lindqvist, A. Antonsson.

City Hospital, Verona, Italy: R. Da Pian, A. Pasqualin, F. Chioffi, A. Beltramello, G. Zampieri, A. Benati, G. Rossi.

University Hospital of Kuopio, Kuopio, Finland: A.H.I. Ronkainen, J. Hernesniemi, M.P. Vapalahti, J.K. Rinne, M.T. Luukkonen, M.V.-M. Vihavainen, S. Savolainen, T. Koivisto, S. Leivo, K. Helin.

Stanford University Medical Center, Stanford, California, USA: G. Steinberg, M.P. Marks, M. Vanefsky, A. Norbash, R. Thompson, T. Bell, M. Marcellus, A. Meyer.

Radcliffe Infirmary, Oxford, England: R.S.C. Kerr, C.B.T. Adams, A.J. Molyneux, S. Vinden, F. Bacon, J. Shrimpton, S. Parker.

University of Florida, Gainesville, Florida, USA: A.L. Day, S.E. Nadeau, J. Stachniak, W. Friedman, R.G. Fessler, K. Peters, R.P. Jacob, S.N. Roper, A. Smith, P. LaFrentz.

University of Iowa/University Hospitals, Iowa City, Iowa, USA: M. Howard, C.M. Loftus, H.P. Adams, Jr., D.L. Crosby, M. Rogers.

University of Cincinnati Medical Center, Cincinnati, Ohio, USA: J. Broderick, J.M. Tew, Jr., T. Brott, H.R. vanLoveren, H.-S. Yeh, M. Zuccarello, T. Tomsick, M.F. Gaskill-Shipley, L. Minneci, N. McMahon.

Clinique Universitaire, Bordeaux, France: J.-P. Castel, J. M. Orgogozo, H. Loiseau, P. Bourgeois, J. Berge, V. Dousset, E. Cuny.

University of Ottawa/Ottawa General Hospital, Ottawa, Ontario, Canada: M.T. Richard, C. Agbi, H. Hugenholtz, B. Benoit, W. Morrish, R. Wee, S. Grahovac, L. Pratt, M. Mortensen.

Neurochiurgia I-Ospedale Bellaria, Bologna, Italy: A. Andreoli, C. Testa, V. Comani, C. Trevisan, P. Limoni, F. Carlucci, M. Leonardi, C. Sturiale.

Universitätsklinik für Neurochirurgie, Graz, Austria: G. Pendl, H.G. Eder, G.E. Klein, M. Eder, K. Leber.

Indianapolis Neurosurgical Group, Indianapolis, Indiana, USA: T. Horner, T.J. Leipzig, T.D. Payner, A.J. Denardo, J.A. Scott, K. Redelman.

University of Alabama at Birmingham, Birmingham, Alabama, USA: W.S. Fisher III, M. Rosner, G. Vitek, M. Hand, W. Flack.

Université Paris VI, Paris, France: J.-P. Sichez, B. Pertuiset, D. Fohanno, C. Marsault, A. Casasco, A. Biondi, L. Capelle, H. Duffau.

University of Washington School of Medicine, Seattle, Washington, USA: H.R. Winn, M.S. Grady, D.W. Newell, W. Longstreth, P. Thompson, H. Bybee, D. Jones.

University of Alberta, Edmonton, Edmonton, Alberta, Canada: J.M. Findlay, K.C. Petruk, D.E. Steinke, R. Ashforth, P. Stenerson, D. Schindel, H. Vandenhoven, J. Neves.

University of Pennsylvania, Philadelphia, Pennsylvania, USA: E. Zager, E. Flamm, E. Raps, R. Hurst, S. Parrott, M. Sellers, M. Torchia.

University of Manitoba/Neurosurgical Associates of Winnipeg, Winnipeg, Manitoba, Canada: B. Anderson, M. West, D. Fewer, N.C. Hill, G. Sutherland, I. Ross, B. McClarty, R. Brownstone, O. Williams, P. Narotam, L. Christane, G. McGinn, D. Gladish.

University of Cambridge, Cambridge, England: P.J. Kirkpatrick, J. Pickard, N. Antoun, D. Simpson, N. Higgins, C. Turner, S. Tebbs.

Victoria General Hospital/Dalhousie University Medical School, Halifax, Nova Scotia, Canada: R.O. Holness, D. Malloy, S.J. Phillips, W.J. Maloney, V. Molina-de-Orozco, B. Baxter, K. Connolly-Campbell, A. MacDougall.

University of Toronto, The Toronto Hospital, Western Division, Toronto, Ontario, Canada: F. Gentili, M.C. Wallace, K. ter Brugge, R.A. Willinsky, M. Tymianski, L. Rickards.

University of Toronto, St. Michael’s Hospital, Toronto, Ontario, Canada: W.S. Tucker, C. Lambert, W. Montanera, C. Rychlewski, C. Flood.

Università di Milano, Milan, Italy: R.M. Villani, E.P. Sganzerla, G. Tomei, A. Bettinelli, M. Leonardi, G. Ceccarelli, A. Righini, L. Bello, C. Marras.

Frenchay Healthcare Trust, Bristol, England: R.J. Nelson, T. Lewis, C. Renowden, Y. Clarke, L. Varian.

Cleveland Clinic, Cleveland, Ohio, USA: D. Chyatte, C. Sila, J. Perl, T. Masaryk, R. Porterfield.

The Walton Centre, Liverpool, England: M.D.M. Shaw, P.M. Foy, T.E. Nixon, L. Dunn, N. Clitheroe, T. Smith, P. Eldridge, P. Humphrey, J. Wiseman, K. Hawkins, L. Owen, K. Ost, S. Saminaden.

Jewish General Hospital/McGill University, Montreal, Quebec, Canada: G. Mohr, R. Schondorf, J. Carlton, M. Maleki, N. Just, S.E. Brien, S. Entis, D. Tampieri, N. Simons.

Academisch Ziekenhuis Groningen/University Hospital, Groningen, the Netherlands: J.J.A. Mooij, J. Metzemaekers, J.M. Hew, J.W.F. Beks, A.J. van der Veen, I. Bosma, M. Sprengers.

University of Utrecht, Utrecht, the Netherlands: G.J.E. Rinkel, J. van Gijn, L.W.P. Ramos, C.A.F. Tulleken, P. Greebe, F. van Vliet.

University of Copenhagen/Rigshospitalet, Copenhagen, Denmark: S.E. Borgesen, B. Jespersen, T. Boge-Rasmussen, L. Willumsen.

Evanston Hospital, Evanston, Illinois, USA: D. Homer, T. Eller, J. Carpenter, J. Meyer, R. Munson, B. Small.

University of Minnesota, Minneapolis, Minnesota, USA: E. Nussbaum, R. Heros, R. Latchaw, P.J. Camarata, J. Lundgren, N. Mattsen.

The University of Edinburgh/Western General Hospital, Edinburgh, Scotland: I. Whittle, R. Sellar, M. O’Sullivan, A.J.W. Steers, P.F.X. Statham, R. Price, G. Malcolm, B. Hoffmann.

Montefiore University Hospital, Pittsburgh, Pennsylvania, USA: H. Yonas, L. Wechsler, J. Thompson-Dobkin, C. Jungreis, A. Kassam, L. Kirby.

University of Mississippi Medical Center, Jackson, Mississippi, USA: A.D. Parent, A. Lewis, P.A. Azordegan, R.R. Smith, L.F. Alexander, D.L. Gordon, W.F. Russell, R. Brown, G. Benashvili, R. Perry, D.L. Scalzo, G. Mandybur, C. Morgan.

Marshfield Clinic, Marshfield, Wisconsin, USA: P.N. Karanjia, K. Madden, D. Kelman, T. Gallant, H.G. Vanderspek, A. Choucair, J.H. Neal, K. Mancl.

University Hospital, Lund, Sweden: H. Säveland, L. Brandt, S. Holtås, B. Trulsson.

University of Chicago Hospitals, Chicago, Illinois, USA: R.L. Macdonald, B.K. Weir, S. Mojtahedi, C. Amidei.

University of Amersterdam/Academisch Medisch Centrum, Amsterdam, the Netherlands: M. Vermeulen, D.A. Bosch, F.J.H. Hulsmans, K.W. Albrecht, Y. Roos, A. Vet, A. Gorissen, M. Mechielsen.

UCLA Medical Center, Los Angeles, California, USA: N. Martin, Y. Gobin, J. Saver, F. Vinuela, G.R. Duckwiler, D.F. Kelly, J.G. Frazee, R. da Graca, T. Gravori.

Charing Cross Hospital (Fulham)/University of London/Regional Neurosciences Centre, London, England: R.D. Illingworth, P.G. Richards, J. Wade, I. Colquhoun, E.F.M. Bashir, S. Shortt.

University of Massachusetts, Worcester, Massachusetts, USA: J. Weaver, M. Fisher, B. Stone, S. Chaturvedi, R. Davidson, K. Davidson.

Istituto Neurologico "C. Besta," Milan, Italy: S. Giombini, C.L. Solero, A. Boiardi, C. Cimino, S. Valentini, A. Silvani.

Duke University Medical Center, Durham, North Carolina, USA: M.J. Alberts, A. Friedman, A. Gentry, K. Hoffman.

University of Colorado Health Sciences Center/Denver General Hospital, Denver, Colorado, USA: R. Hughes, K.O. Lillihei, M.P. Earnest, J. Nichols, G. Kindt, A. Anderson, S. Levy, J. Nichols, R. Smith, R. Breeze, V. Noonan.

University of California – San Francisco, San Francisco, California, USA: D. Gress, C.F. Dowd, J Vanwestrop, C. Wilson, M. Berger, L. Hannegan.

University of Miami, Miami, Florida, USA: R. Heros, J. Marcos, L. Ugarte.

The National Hospital for Neurology and Neurosurgery/Queen Square, London, England: N. Kitchen, W. Taylor, M. Kumar, J. Grieve.

University of British Columbia/Vancouver General, Vancouver, B.C., Canada: F. Durity, M. Boyd, D. Fairholm, D. Griesdale, C. Honey, G. Redekop, B. Toyota, I. Turnbull, W. Woodhurst, T. Zwimpfer, P. Teal, D. Grabe, A. Brevner.

Ruprecht-Karls-Universität Heidelberg, Klinikum Mannheim, Neurochirurgische Klinik, Mannheim, Germany: A. Piepgras, P. Schmiedek, A. Schwartz, T. Weber.

Northwestern University Medical School, Chicago, Illinois, USA: J. Biller, D. Chyatte, S. Brem, G. Cybulski, L. Chadwick, K. Bronstein.

Freie Universität Berlin, Universitatsklinikum Benjamin Franklin, Berlin, Germany: T. Pietilä, M. Brock, D. Krug, I. Krznaric.

University Central Hospital of Helsinki, Helsinki, Finland: J. Hernesniemi, R. Kivisaari.

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