1. PharmaBiotec Research Center, the Neurobiology Unit, Department of Biological Sciences, Royal Danish School of Pharmacy, Copenhagen, Denmark
2. Medical School, Department of Neurobiology and Anatomy, University of Texas, Houston, Texas, U.S.A.
3. Center of Morphology, Goethe‐University, Frankfurt, Germany
4. Institute of Neurophysiology, University of Köln, Köln, Germany
5. Institute of Anatomy, University of Köln, Köln, Germany
6. Department of Cell Biology and Neuroanatomy, University of Minnesota, Minneapolis, Minnesota, U.S.A.