1. Department of Neuroscience, Farber Institute for Neurosciences, Thomas Jefferson University Medical College, Philadelphia, Pennsylvania.
2. Laboratory of General Histology, Neuroanatomy and Neuropathology, Université Libre de Bruxelles, Bruxelles, Belgium.
3. Evolutionary Morphology of Vertebrates, Ghent University, Gent, Belgium.
4. Department of Biology, Arcadia University, Glenside, Pennsylvania.