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.
Siersema PD, van Helvoirt RP, Cleton-Soeteman MI, de Bruijn WC, Wilson JH, van Eijk HG.Siersema PD, et al. Among authors: van helvoirt rp.Biol Trace Elem Res. 1992 Oct;35(1):65-72. doi: 10.1007/BF02786238.Biol Trace Elem Res. 1992.PMID: 1384628
Siersema PD, van Helvoirt RP, Ketelaars DA, Cleton MI, de Bruijn WC, Wilson JH, van Eijk HG.Siersema PD, et al. Among authors: van helvoirt rp.Hepatology. 1991 Dec;14(6):1179-88.Hepatology. 1991.PMID: 1959868
Fiets WE, van Helvoirt RP, Nortier JW, van der Tweel I, Struikmans H.Fiets WE, et al. Among authors: van helvoirt rp.Eur J Cancer. 2003 May;39(8):1081-8. doi: 10.1016/s0959-8049(03)00178-3.Eur J Cancer. 2003.PMID: 12736107Clinical Trial.