1. Nursing School, General Hospital, Medical University Vienna, 1090 Vienna, Austria
2. Centre for Public Health, Department of Social and Preventive, Medical University of Vienna, 1090 Vienna, Austria
3. Academy for Ageing Research, Haus der Barmherzigkeit, 1160 Vienna, Austria
4. Department of Social and Preventive Medicine, Centre for Public Health, Medical University of Vienna, Kinderspitalgasse 15/1, 1090 Vienna, Austria