dean

SUMMARY The English summary of this article is available at the end of the document (article in Slovak).

SUMMARY This article is available only in Slovak without a summary.

SUMMARY This article is available only in Slovak without a summary.

SUMMARY This article is available only in Slovak without a summary.

SUMMARY This article is available only in Slovak without a summary.

SUMMARY This article is available only in Slovak without a summary.

SUMMARY This article is available only in Slovak without a summary.