Smoker, ex-smoker or non-smoker? The validity of routinely recorded smoking status in UK primary care: a cross-sectional study.

Marston, L; Carpenter, JR; Walters, KR; Morris, RW; Nazareth, I; White, IR; Petersen, I; (2014) Smoker, ex-smoker or non-smoker? The validity of routinely recorded smoking status in UK primary care: a cross-sectional study. BMJ open, 4 (4). e004958. ISSN 2044-6055 DOI: https://doi.org/10.1136/bmjopen-2014-004958

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