1/10/1990-22/12/1990 Centre Paul Lamarque Montpellier France

25/9/1991-18/10 /1991 Hosp Paul Brousse Paris France

20/10/1993-20/08/1994 Thomas Starzle Transplantation Institute Pittsburgh PA USA

21/08/1994-19/09/1994 Spring Branch Medical Center Houston TX USA

7-27/06/2001 &24/03-04/04/2003 2nd Surg Dpt General Hospital of Linz Austria