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.
Molina JM, Andrade-Villanueva J, Echevarria J, Chetchotisakd P, Corral J, David N, Moyle G, Mancini M, Percival L, Yang R, Thiry A, McGrath D; CASTLE Study Team.Molina JM, et al.Lancet. 2008 Aug 23;372(9639):646-55. doi: 10.1016/S0140-6736(08)61081-8.Lancet. 2008.PMID: 18722869Clinical Trial.