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Davey Smith G, Sterne JA, Fraser A, Tynelius P, Lawlor DA, Rasmussen F.Davey Smith G, et al. Among authors: sterne ja.BMJ. 2009 Dec 22;339:b5043. doi: 10.1136/bmj.b5043.BMJ. 2009.PMID: 20028778Free PMC article.
Lawlor DA, Smith GD, Leon DA, Sterne JA, Ebrahim S.Lawlor DA, et al. Among authors: sterne ja.Lancet. 2002 Dec 7;360(9348):1818-23. doi: 10.1016/S0140-6736(02)11769-7.Lancet. 2002.PMID: 12480358