Creative Commons licence (Attribution-Non-Commercial-No Derivative works). They may be consulted and distributed freely provided that the author and publisher are quoted (in accordance with the “Recommended citation” section in each of the articles). However, no derivative works (translation, change of format, etc.) may be made without the publisher’s permission. Therefore, it meets the definition of open access form the Budapest Open Access Initiative declaration. The journal allows the author(s) to hold the copyright without restrictions and to retain publishing rights without restrictions.