| http://www.w3.org/ns/prov#value | - and craving of individual substances, including opiates, cocaine, alcohol, cannabis, sedative-hypnotics, stimulants, phencyclidine hydrochloride, and others, followed by 5 summary items: days per week using substances (any drugs or alcohol), days per week using cocaine or heroin, days per week using drugs intravenously, days per week experiencing a craving for any substance, and average intensity
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