1. Department of Human Biology; Wrocław University; Kuźnicza 35 50-138 Wrocław Poland
2. Department of Quantitative Methods in Economics; Wrocław University of Economics; Komandorska 118/120 53-345 Wrocław Poland
3. Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw; Pawińskiego 5a 02-160 Warsaw Poland