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.
de Graaf LE, Gerhards SA, Evers SM, Arntz A, Riper H, Severens JL, Widdershoven G, Metsemakers JF, Huibers MJ.de Graaf LE, et al. Among authors: riper h.BMC Public Health. 2008 Jun 30;8:224. doi: 10.1186/1471-2458-8-224.BMC Public Health. 2008.PMID: 18590518Free PMC article.Clinical Trial.
Warmerdam L, van Straten A, Twisk J, Riper H, Cuijpers P.Warmerdam L, et al. Among authors: riper h.J Med Internet Res. 2008 Nov 20;10(4):e44. doi: 10.2196/jmir.1094.J Med Internet Res. 2008.PMID: 19033149Free PMC article.Clinical Trial.
Riper H, Kramer J, Keuken M, Smit F, Schippers G, Cuijpers P.Riper H, et al.J Med Internet Res. 2008 Nov 22;10(4):e46. doi: 10.2196/jmir.1102.J Med Internet Res. 2008.PMID: 19033150Free PMC article.Clinical Trial.