[1] UNIV GOTTINGEN,NEUROL KLIN,D-3400 GOTTINGEN,FED REP GER
[2] BEHRINGWERKE AG,D-3550 MARBURG,FED REP GER
[3] UNIV TURIN,NEUROCHIRURG KLIN,I-10124 TURIN,ITALY
[4] SPANISH HOSP,BUENOS AIRES,ARGENTINA
[5] BEZIRKSKRANKENHAUS GUNZBURG,GUNZBURG,FED REP GER
[6] EV STIFT ST MARTIN,KOBLENZ,FED REP GER
[7] UNIV HAMBURG,NEUROL KLIN,D-2000 HAMBURG 13,FED REP GER