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.
Mitchell I, Corey M, Woenne R, Krastins IR, Levison H.Mitchell I, et al. Among authors: levison h.J Pediatr. 1978 Nov;93(5):744-8. doi: 10.1016/s0022-3476(78)81070-1.J Pediatr. 1978.PMID: 712474
Kattan M, Mansell A, Levison H, Corey M, Krastins IR.Kattan M, et al. Among authors: levison h.Thorax. 1980 Jul;35(7):531-5. doi: 10.1136/thx.35.7.531.Thorax. 1980.PMID: 6449095Free PMC article.Clinical Trial.