The research was supported by the European Union and the State of Hungary, co-financed by the European Social Fund within the framework of TÁMOP-4.2.4.A/2-11/1-2012-0001 ‘National Program of Excellence’ – convergence program for the elaboration and execution of a national personal support system for students and researchers. The project is implemented with the support of the European Union and co-financed by the European Social Fund.