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The whole article is available in pdf after clicking on “Full article” below.

The whole article is available in pdf after clicking on “Full article” below.

The whole article is available in pdf after clicking on “Full article” below.

The whole article is available in pdf after clicking on “Full article” below.

The whole article is available in pdf after clicking on “Full article” below.

The whole article is available in pdf after clicking on “Full article” below.

This article is available only in Slovak without a summary.

This article is available only in Slovak without a summary.

This article is available only in Slovak.