1 European Observatory of Health Inequalities, Calisia University, Kalisz, Poland; Health Promotion Foundation, Nadarzyn, Poland. Electronic address: wazatonski@promocjazdrowia.pl.
2 European Observatory of Health Inequalities, Calisia University, Kalisz, Poland; Department for Health, University of Bath, United Kingdom.
3 European Observatory of Health Inequalities, Calisia University, Kalisz, Poland; Health Promotion Foundation, Nadarzyn, Poland.
4 Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, United Kingdom.