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All these samples were analyzed anonymously within the scope of routine laboratorial work (analysis of psychotropic substances), and therefore there was no requirement for ethical approval.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"The authors declare no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}}]}}