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.
Tsui PT, Lai ST, Leung WS, Mok NS, Wu CW, Lau ST, Choi YC.Tsui PT, et al. Among authors: mok ns.Hong Kong Med J. 2002 Feb;8(1):57-9.Hong Kong Med J. 2002.PMID: 11861996Free article.