Ramadan, W. S., professor, Anatomy and embryology department, faculty of medicine, king abdulaziz university Ramakrishnan, S. Ramesh, Balasundari Rameshrad, M., Department of pharmacology and Toxicology; School of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran Ramirez, L.M. Ramos-Vega, V. Rams, D. Ramspott, Martina Ranketi, S.S. Rapacka, E. Rapalska, Katarzyna Rapalska, Katarzyna, Department of Anatomy, University of Medical Sciences, Poznań, Poland Rapalska, Katarzyna, Department of Anatormy, University School of Medical Sciences, Poznań, Poland Raputa, Wiktor Rașcu, A. Rashed, l A Rashed, L. A. Rashed, L. Rashid, R.J. Rasouli, B., Ph.D. Candidate of Comparative Anatomy, Department of Basic Sciences, School of Veterinary Medicine, Shiraz University, Shiraz, Iran. Rastogi, R. Ratajczak, Ilona Ratajczak, Wojciech Ratajczak, Wojciech, Department of Anatomy, University of Medical Sciences, Poznań, Poland Ratajczak, Wojciech, Departament of Anatomy, Karol Marcinkowski University School of Medical Sciences, Poznań, Poland