1 Centre for Molecular Medicine and Stem Cell Research, Faculty of Medical Science, University of Kragujevac, 69 Svetozara Markovica Street, 34000 Kragujevac, Serbia; Institute of Anatomy, University of Bern, Baltzerstrasse 2, 3000 Bern 9, Switzerland.
2 Institute of Genetic Medicine, Newcastle University, Central Parkway, Newcastle upon Tyne NE1 3BZ, UK.
3 Centre for Molecular Medicine and Stem Cell Research, Faculty of Medical Science, University of Kragujevac, 69 Svetozara Markovica Street, 34000 Kragujevac, Serbia; Spebo Medical, 16 Norvezanska Street, 16000 Leskovac, Serbia.