1. Institute of Veterinary Anatomy, Histology and Embryology Justus‐Liebig‐University of Giessen Giessen Germany
2. Clinic of Small Animals c/o Institute of Veterinary Anatomy, Histology and Embryology Justus‐Liebig‐University of Giessen Giessen Germany
3. Anatomy and Embryology Department Faculty of Veterinary Medicine University of Mansoura Mansoura Egypt