WHO Collaborating Centre for Drug Statistics Methodology. (2017) Guidelines for ATC classification and DDD assignment 2018. Oslo: WHO Collaborating Centre for Drug Statistics Methodology.
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The Anatomical Therapeutic Chemical (ATC) classification system and the Defined Daily Dose (DDD) as a measuring unit are recommended by the WHO for drug utilization monitoring and research . The system is widely used internationally and the number of users is increasing. The purpose of preparing guidelines is to make information about the ATC/DDD system available to the users.
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