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.
Chen Z, Cui Y, Owonikoko TK, Wang Z, Li Z, Luo R, Kutner M, Khuri FR, Kowalski J.Chen Z, et al. Among authors: owonikoko tk.Contemp Clin Trials. 2014 Mar;37(2):322-32. doi: 10.1016/j.cct.2014.02.004. Epub 2014 Feb 12.Contemp Clin Trials. 2014.PMID: 24530487Free PMC article.