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Confounding of Subgroup Analyses in Randomized Data
Rolf H. H. Groenwold, MD, PhD, A. Rogier T. Donders, PhD, Geert J. M. G. van der Heijden, PhD, Arno W. Hoes, MD, PhD, Maroeska M. Rovers, PhD
Arch Intern Med. 2009;169(16):1532-1534.
Published online September 12, 2009

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