1. Institute of Anatomy, Department of Biomedicine; University of Basel; Basel Switzerland
2. Division of Gross Anatomy; Institute of Anatomy, University of Zurich; Zurich Switzerland
3. Institute of Neuroradiology, University Hospital Magdeburg, Otto-von-Guericke University; Magdeburg Germany
4. Division of Anatomy, Department of Medicine; University of Fribourg; Fribourg Switzerland