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Vandenbroucke, Jan; Pearce, Neil; (2015) Point: incident exposures, prevalent exposures, and causal inference: does limiting studies to persons who are followed from first exposure onward damage epidemiology? American journal of epidemiology, 182 (10). pp. 826-833. ISSN 0002-9262 DOI: https://doi.org/10.1093/aje/kwv225
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