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Vandenbroucke JP, van der Meer FJ, Helmerhorst FM, Rosendaal FR.Vandenbroucke JP, et al.BMJ. 1996 Nov 2;313(7065):1127-30. doi: 10.1136/bmj.313.7065.1127.BMJ. 1996.PMID: 8916702Free PMC article.Review.
van Hylckama Vlieg A, Helmerhorst FM, Vandenbroucke JP, Doggen CJ, Rosendaal FR.van Hylckama Vlieg A, et al. Among authors: vandenbroucke jp.BMJ. 2009 Aug 13;339:b2921. doi: 10.1136/bmj.b2921.BMJ. 2009.PMID: 19679614Free PMC article.