2) United States Public Health Service. Healthy People: The Surgeon General's Report on Health Promotion and Disease Prevention. USA: United States Public Health Service, 1979.
3) World Health Organization. Social Determinants of Health The Solid Facts 2nd edition. Wilkinson R, Marmot M ed, Denmark: WHO Regional Office for Europe, 2003.
4) Kagamimori S, Gaina A, Nasermoaddeli A. Socio- economic status and health in the Japanese popula- tion. Soc Sci Med 2009; 68: 2152-2160.
5) Donaldson LJ, Clayton DG, Clarke M. The elderly in residential care: Mortality in relation to functional capacity. Epidemiol Community Health 1980; 34: 96-101.