Exeter, England.
Nepean Hospital, Sydney, Australia.
Poly Clinic d'Argonay, France.
St. Marian Hospital, Borken, Germany.
Orthopaedische Klinik, Markgroningen, Germany.
Hochwaldkrankenhaus, Bad Nauheim, Germany.
Methodist Hospital, Texas Medical Centre, Houston, USA.
St. Peter's University Hospital, New Jersey, USA.
Fellow, Royal College of Surgeons, UK.
Helios Endo Klinik, Hamburg, Germany.
Advanced Instructional Course, OXFORD, UK.
St. Vincent Hospital LA, USA.
Rush University Medical Center Chicago, USA.
Weiss Memorial Hospital Chicago, USA.
Pius-Hospital Odenburg, Germany.
University Hospital, Barcelona.
Krankenhaus Hedwigshohe, Hohensteig, Berlin, Germany.
Waldkrankenhaus Eisenberg Thuringen, Germany.
O.-L.-V. -van Lourdes Ziekenhuis Waregem, Belgium.
