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A survey was carried out to evaluate the satisfaction with methadone treatment centres of methadone-maintained opioid-dependent patients from Spain. Independent interviewers asked 505 consecutively arriving clients from 20 randomly selected centres (14 conventional centres, two bus units, and four prisons) to participate; 370 (73.3%) clients agreed to fill out the questionnaire, and 351 (69.5%) completed...
The purpose of this study was to describe and assess the utility of an Internet-based survey method for characterizing the alcohol consumption of college students. After extensive pilot research, a random sample of 1910 students aged 16-29 years was invited to complete a questionnaire, consisting of a series of web-pages linked to a relational database on a secure web-site. A branch structure allowed...
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