1. Department of Human Anatomy and Physiology, Section of Anatomy, University of Padua (P.G.A., G.M., G.G.N.), I-35–121 Padua, Italy
2. Department of Histology and Embryology, Poznan School of Medicine (A.M., L.K.M.), PL-60781, Poznan, Poland
3. Department of Pharmacology, Tulane University Medical Center (H.C.C.), New Orleans, Louisiana 70112-2699