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Table 1 Key methodological features of the TDI and SGP surveillance studies

From: General practice patients starting treatment for substance use problems: observations from two data sources across levels of care

 SGPTDI
SettingGeneral practice (primary care)Specialist care for substance use problems (secondary and tertiairy care)
Study designSentinel surveillance by a sample of general practicesRegister completed by caregivers from participating centres
Data collection toolsStandard patient data form/questionnaire to complete by caregivers for every patient starting a new treatment episode
Data transferPostal mail, data entry by SciensanoOnline standard forms to transfer data record by record, or, repository tool to transfer patient data files for a given year