1. Department of Preventive Medicine, Medical University of Łódź, 90 752 Łódź, Poland
2. Department of Public Policy, University of Massachusetts, Boston, MA 02125, USA
3. Department of Social and Preventive Medicine, Medical University of Łódź, 90 752 Łódź, Poland
4. Department of Work Physiology and Ergonomics, Nofer Institute of Occupational Medicine, 91 348 Łódź, Poland