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Integrating and extending cohort studies: lessons from the eXtending Treatments, Education and Networks in Depression (xTEND) study

Joanne Allen*, Kerry J Inder, Terry J Lewin, John R Attia, Frances J Kay-Lambkin, Amanda L Baker, Trevor Hazell and Brian J Kelly

BMC Medical Research Methodology 2013, 13:122  doi:10.1186/1471-2288-13-122