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 Bergen JE, Kerssens JJ, Schellevis FG, Sandfort TG, Coenen TJ, Bindels PJ.van Bergen JE, et al. Among authors: sandfort tg.Br J Gen Pract. 2006 Feb;56(523):104-9.Br J Gen Pract. 2006.PMID: 16464323Free PMC article.
de Graaf R, Sandfort TG, ten Have M.de Graaf R, et al. Among authors: sandfort tg.Arch Sex Behav. 2006 Jun;35(3):253-62. doi: 10.1007/s10508-006-9020-z. Epub 2006 Jun 24.Arch Sex Behav. 2006.PMID: 16799841