[1] KANTONSSPITAL,DEPT CHIRURG,FORSCH ABT,CH-4031 BASEL,SWITZERLAND
[2] F HOFFMANN LA ROCHE & CO AG,DEPT CHIRURG,DEPT PHARMAFORSCH,CH-4031 BASEL,SWITZERLAND
[3] SANDOZ AG,DEPT CHIRURG,PRAKLIN FORSCH ABT,CH-4031 BASEL,SWITZERLAND
[4] UNIV BASEL KLINIKEN,DEPT CHIRURG,ZLF,CH-4031 BASEL,SWITZERLAND