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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
Hepatitis B vaccination and the risk of multiple sclerosis.
Ascherio A, Zhang SM, Hernán MA, Olek MJ, Coplan PM, Brodovicz K, Walker AM. Ascherio A, et al. Among authors: hernan ma. N Engl J Med. 2001 Feb 1;344(5):327-32. doi: 10.1056/NEJM200102013440502. N Engl J Med. 2001. PMID: 11172163
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