1. FREE UNIV BRUSSELS,FAC MED,HISTOL LAB,B-1070 BRUSSELS,BELGIUM. FREE UNIV BRUSSELS,INST RECH INTERDISCIPLINAIRES & DEV INTELLIGENCE,BRUSSELS,BELGIUM. HOP ERASME,SERV ANAT PATHOL,BRUSSELS,BELGIUM. HOP ERASME,SERV NEUROCHIRURG,BRUSSELS,BELGIUM. FREE UNIV BRUSSELS,FAC SCI APPL,DEPT SYST NUMER & LOG,BRUSSELS,BELGIUM.