[1] Univ Zurich, Inst Anat, CH-8057 Zurich, Switzerland
[2] Univ Zurich, Fac Med, CH-8057 Zurich, Switzerland
[3] Inst Anat, Dept Topog Anat & Neuroanat, Bern, Switzerland
[4] Univ Basel, Inst Anat, CH-4056 Basel, Switzerland
[5] Univ Fribourg, Inst Anat & Special Embryol, CH-1700 Fribourg, Switzerland
[6] Univ Lausanne, Inst Biol Cellulaire & Morphol, CH-1015 Lausanne, Switzerland
[7] Univ Lausanne, Dept Neurosci, CH-1015 Lausanne, Switzerland
[8] Univ Geneva, Clin Anat Res Grp, CH-1211 Geneva 4, Switzerland