Copyright © 2012 Witold Chodźko Institute of Rural Health (Lublin). This article is under a Creative Commons Attribution-NonCommercial 3.0 Poland (CC BY-NC 3.0 PL) license
Except where otherwise noted, this item's license is described as  Copyright © 2012 Witold Chodźko Institute of Rural Health (Lublin). This article is under a Creative Commons Attribution-NonCommercial 3.0 Poland (CC BY-NC 3.0 PL) license





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