| http://www.w3.org/ns/prov#value | - The World Health Organisation (WHO) in 1969, defined drug dependence as - 'a state, psychic and sometimes also physical, resulting from the interaction between a living organism and a drug, characterised by behavioural and other responses that always include a compulsion to take the drug on a continuous or periodic basis in order to experience its physical effects, and sometimes to avoid the disco
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