1. From the Department of Neurology, Academic Hospital Rotterdam (F.G.A.M.), and the Department of Trials and Statistics, Daniel den Hoed Cancer Center (P.I.M.S.), both in Rotterdam, the Netherlands. Address reprint requests to Dr. van der Meché at the Department of Neurology — Ee2222, Academic Hospital Rotterdam and Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, the Netherlands.
2. See the Appendix for a list of the participants in the Dutch Guillain–Barré Study Group.