Arch Intern Med. 2009 Sep 14;169(16):1532-4.

Confounding of subgroup analyses in randomized data.

Groenwold RH, Donders AR, van der Heijden GJ, Hoes AW, Rovers MM.

University Medical Center Utrecht, Julius Center for Health Sciences and Primary Care, PO Box 85500, 3508 GA, Utrecht, The Netherlands. r.h.h.groenwold@umcutrecht.nl

PMID: 19752412 [PubMed - indexed for MEDLINE]

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