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Should Systematic Reviewers Search for Randomized, Controlled Trials Published as Letters?
Alla E. Iansavichene, MLIS; Margaret Sampson, MLIS; Jessie McGowan, MLIS; Isola S.Y. Ajiferuke, PhD
Annals of Internal Medicine 2008;148:714-715. doi:10.7326/0003-4819-148-9-200805060-00023

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