[1] HOP UNIV ST PIERRE, CTR PUBL AIDE SOCIAL BRUXELLES, B-1000 BRUXELLES, BELGIUM
[2] UNIV VIRGINIA, MED CTR, DEPT SURG, DIV SURG ONCOL, CHARLOTTESVILLE, VA 22908 USA
[3] UNIV MARBURG KLINIKUM, MED KLIN, D-3550 MARBURG, FED REP GER
[4] HANOVER UNIV MED, POLIKLIN, DEPT INNERE MED, D-3000 HANOVER, FED REP GER
[5] GRP HOSP PAUL BROUSSE, INST CANC & IMMUNOGENET, F-94800 VILLEJUIF, FRANCE