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.
Scheffers FR, Bekkers MB, Kerkhof M, Gehring U, Koppelman GH, Schipper M, Haveman-Nies A, Wijga AH.Scheffers FR, et al. Among authors: bekkers mb.BMC Public Health. 2013 Dec 5;13:1119. doi: 10.1186/1471-2458-13-1119.BMC Public Health. 2013.PMID: 24305556Free PMC article.
van Oeffelen AA, Bekkers MB, Smit HA, Kerkhof M, Koppelman GH, Haveman-Nies A, van der A DL, Jansen EH, Wijga AH.van Oeffelen AA, et al. Among authors: bekkers mb.Pediatr Allergy Immunol. 2011 Dec;22(8):784-93. doi: 10.1111/j.1399-3038.2011.01190.x. Epub 2011 Sep 19.Pediatr Allergy Immunol. 2011.PMID: 21929603