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The method of
m:n matched-pairs matching (every available control in the population of pooled controls
was selected for each case) was used instead of the conventional 1:n matched-pairs method. References: Yokoyama T, et al. Annual Report of Research Committee on Epidemiology of Intractable Diseases 1996:123-27 (in Japanese) . Hamajima N, et al. J Clin Epidemiol 1994;47:971-75. |