1. Institute of Statistics and Demography, SGH Warsaw School of Economics , Warsaw , Poland
2. Department of Health Studies, College of Health Sciences, University of Rhode Island , Providence, Rhode Island , USA
3. Department of Sociology, Anthropology, and Public Health, College of Arts, Humanities, and Social Sciences, University of Maryland , Baltimore, Maryland , USA
4. Department of Statistical Science and Department of Philosophy, Sociology, Education and Applied Psychology, University of Padua , Padua , Italy