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A structural approach to selection bias.
Hernán MA, Hernández-Díaz S, Robins JM. Hernán MA, et al. Epidemiology. 2004 Sep;15(5):615-25. doi: 10.1097/01.ede.0000135174.63482.43. Epidemiology. 2004. PMID: 15308962
Transmission dynamics and control of severe acute respiratory syndrome.
Lipsitch M, Cohen T, Cooper B, Robins JM, Ma S, James L, Gopalakrishna G, Chew SK, Tan CC, Samore MH, Fisman D, Murray M. Lipsitch M, et al. Science. 2003 Jun 20;300(5627):1966-70. doi: 10.1126/science.1086616. Epub 2003 May 23. Science. 2003. PMID: 12766207 Free PMC article.