[1] CTR HOSP UNIV STRASBOURG,SERV CHIRURG GEN 3,F-67 STRASBOURG,FRANCE
[2] UNIV MAINZ,CHIRURG KLIN,LANGENBECK STR 1,D-6500 MAINZ,FED REP GER
[3] UNIV CALIF,SCH MED,DEPT SURG,LOS ANGELES,CA 90024
[4] UNIV HEIDELBERG,KLIN MANNHEIM,CHIRURG KLIN,THEODOR KUTZER UFER,D-6800 MANNHEIM,FED REP GER