Anatomical Therapeutic Chemical classification. Organization, W. H. April, 2012.
Anatomical Therapeutic Chemical classification [link]Paper  bibtex   
@misc{world_health_organization_anatomical_2012,
	title = {Anatomical {Therapeutic} {Chemical} classification},
	url = {http://www.whocc.no},
	urldate = {2014-07-03},
	author = {World Health Organization},
	month = apr,
	year = {2012}
}

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