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.
Hanselaar A, van Loosbroek M, Schuurbiers O, Helmerhorst T, Bulten J, Bernhelm J.Hanselaar A, et al.Cancer. 1997 Jun 1;79(11):2229-36. doi: 10.1002/(sici)1097-0142(19970601)79:11<2229::aid-cncr22>3.0.co;2-x.Cancer. 1997.PMID: 9179071
Berkers LM, van Ballegooijen M, van Kemenade FJ, Rebolj M, Essink-Bot ML, Helmerhorst TJ, Habbema JD.Berkers LM, et al. Among authors: helmerhorst tj.Ned Tijdschr Geneeskd. 2007 Jun 9;151(23):1288-94.Ned Tijdschr Geneeskd. 2007.PMID: 17624160Dutch.
Geertsen M, Bais AG, Beerman H, Helmerhorst TJ.Geertsen M, et al. Among authors: helmerhorst tj.Ned Tijdschr Geneeskd. 2003 Dec 6;147(49):2430-4.Ned Tijdschr Geneeskd. 2003.PMID: 14694554Dutch.