Pomeranian Medical University, Pomeranian Medical University, affiliation not provided to SSRN, affiliation not provided to SSRN, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, affiliation not provided to SSRN, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, Pomeranian Medical University, University of Zielona Gora, University of Zielona Gora, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Rzeszów, affiliation not provided to SSRN, affiliation not provided to SSRN, Medical University of Bialystok, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Newcastle and affiliation not provided to SSRN