1. Department of Neurosurgery, Medical and Health Science Center, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary
2. Faculty of Dentistry, Medical and Health Science Center, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary
3. Department of Inorganic and Analytical Chemistry, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary
4. Institute of Medical Microbiology, Medical and Health Science Center, University of Debrecen, Nagyerdei krt. 98, 4012 Debrecen, Hungary