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.
Gjertsen F, Leenaars A, Vollrath ME.Gjertsen F, et al. Among authors: vollrath me.Int J Environ Res Public Health. 2013 Dec 30;11(1):487-506. doi: 10.3390/ijerph110100487.Int J Environ Res Public Health. 2013.PMID: 24380979Free PMC article.
Ystrom E, Niegel S, Klepp KI, Vollrath ME.Ystrom E, et al. Among authors: vollrath me.J Pediatr. 2008 Jan;152(1):68-72. doi: 10.1016/j.jpeds.2007.06.005. Epub 2007 Oct 24.J Pediatr. 2008.PMID: 18154903
Niegel S, Ystrom E, Vollrath ME.Niegel S, et al. Among authors: vollrath me.J Dev Behav Pediatr. 2007 Dec;28(6):462-6. doi: 10.1097/DBP.0b013e31811431e8.J Dev Behav Pediatr. 2007.PMID: 18091091