title: Randomized Clinical Trials and Observational Studies: Is There a Battle?
authors.affiliation: The University of Texas MD Anderson Cancer Center, Houston, TX.
authors.forename: Mariana
authors.initials: M
authors.lastname: Chavez-MacGregor
authors.affiliation: The University of Texas MD Anderson Cancer Center, Houston, TX sgiordan@mdanderson.org.
authors.forename: Sharon H
authors.initials: SH
authors.lastname: Giordano
mesh_terms: D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design