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Douglas, IJ; Evans, SJ; Hingorani, AD; Grosso, AM; Timmis, A; Hemingway, H; Smeeth, L; (2012) Clopidogrel and interaction with proton pump inhibitors: comparison between cohort and within person study designs. BMJ (Clinical research ed), 345. e4388. ISSN 0959-8138 DOI: https://doi.org/10.1136/bmj.e4388