[1] HOP NECKER,DEPT PEDIAT,F-75730 PARIS 15,FRANCE
[2] UNIV GOTTINGEN,PADIAT & NEUROPADIAT KLIN,KINDERKIN,D-3400 GOTTINGEN,FED REP GER
[3] NEUROL KRANKENHAUS STADT WIEN ROSENHUGEL,LUDWIG BOLTZMANN INST ERFORSCH KINDICHER HIRNSCHADEN,VIENNA,AUSTRIA
[4] HOSP SICK CHILDREN,LONDON WC1N 3JH,ENGLAND