[1] Department of Surgery,
[2] University of Innsbruck,undefined
[3] Anichstraße 35,undefined
[4] A-6020 Innsbruck,undefined
[5] Austria Tel.: +43-512-5048544 Fax: +43-512-5042347,undefined
[6] Department of Surgery,undefined
[7] Hospital of Bludenz,undefined
[8] Bludenz,undefined
[9] Austria,undefined