Occupational health development in a country can be classifiedinto 3 phases as External, Internal (or Personal), and Social Environmental Phases. Occupational health usually focuses on work environment, but it cannot advance without controlling workers’ health and cannot be achieved without a complimentary understanding of the social security system. Society may con-tinue wasting social costs for determining whether a disease of workers is caused by or arising from work. In order to understand the status of occupational diseases in a country, one must know about the comprehensiveness of the social security system in that society.
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