1. Klinik St. Anna, Institute of Radiology and Nuclear Medicine, Luzern, Switzerland
2. Department of Radiology, Lindenhofspital Bern, Swiss Intervention Center for Microtherapy, Bern
3. Department of Radiology, Faculty of Medicine, University of British Columbia, Vancouver Canada
4. Klinik Hirslanden, Swiss Intervention Center of Microtherapy, Zürich, Switzerland