An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
van Stiphout F, Zwart-van Rijkom JE, Aarts JE, Koffijberg H, Klarenbeek-deJonge E, Krulder M, Roes KC, Egberts AC, ter Braak EW.van Stiphout F, et al. Among authors: koffijberg h.Trials. 2015 May 22;16:223. doi: 10.1186/s13063-015-0744-8.Trials. 2015.PMID: 25997633Free PMC article.Clinical Trial.
van Giessen A, de Wit GA, Moons KGM, Dorresteijn JAN, Koffijberg H.van Giessen A, et al. Among authors: koffijberg h.J Clin Epidemiol. 2018 Feb;94:122-131. doi: 10.1016/j.jclinepi.2017.09.020. Epub 2017 Oct 3.J Clin Epidemiol. 2018.PMID: 28986242