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.
Helmert U, Shea S, Herman B, Greiser E.Helmert U, et al.Public Health. 1990 Nov;104(6):399-416. doi: 10.1016/s0033-3506(05)80083-6.Public Health. 1990.PMID: 2274644
Helmert U, Shea S, Bammann K.Helmert U, et al.Rev Environ Health. 1997 Jan-Mar;12(1):25-42. doi: 10.1515/REVEH.1997.12.1.25.Rev Environ Health. 1997.PMID: 9128909Review.
Helmert U, Shea S.Helmert U, et al.Rev Environ Health. 1997 Apr-Jun;12(2):125-30. doi: 10.1515/reveh.1997.12.2.125.Rev Environ Health. 1997.PMID: 9273929
Helmert U, Mielck A, Shea S.Helmert U, et al.Rev Environ Health. 1997 Jul-Sep;12(3):159-70. doi: 10.1515/REVEH.1997.12.3.159.Rev Environ Health. 1997.PMID: 9406287
Helmert U, Shea S.Helmert U, et al.Rev Environ Health. 1997 Oct-Dec;12(4):253-60. doi: 10.1515/reveh.1997.12.4.253.Rev Environ Health. 1997.PMID: 9553999
Helmert U, Shea S, Bammann K.Helmert U, et al.Rev Environ Health. 1999 Oct-Dec;14(4):239-49. doi: 10.1515/reveh.1999.14.4.239.Rev Environ Health. 1999.PMID: 10746736