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The systematic and long-term efforts to protect the environment may be successful also in the country in the period of transition from centrally planned to free market economies. The basic requirement is to disseminate reliable information on the exposure levels and expected health effects. The need for high quality information underscores the importance of the quality assurance and quality control systems in the context of good laboratory as well as epidemiologic practices. Each monitoringpmid:11548065 fatcat:hvcieycthndhhbj4ihsw5ajrmi