1. Angiology, Med. University Hospital, Kantonsspital Baselland, Bruderholz, Switzerland
2. Institute for Anatomy, Departement Biomedizin, Universität Basel, Switzerland
3. Radiology, Kantonsspital Frauenfeld, Frauenfeld, Switzerland
4. Clinic for Venous Diseases, Bellevue, Kreuzlingen, Switzerland