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.
Cao SL, Liu TF, Wang ZH, Zhou J, Huang KM, Yao WQ, Shen XL.Cao SL, et al. Among authors: liu tf.Int J Radiat Oncol Biol Phys. 1989 Feb;16(2):343-5.Int J Radiat Oncol Biol Phys. 1989.PMID: 2921136
Fu XL, Jiang GL, Wang LJ, Qian H, Fu S, Yie M, Kong FM, Zhao S, He SQ, Liu TF.Fu XL, et al. Among authors: liu tf.Int J Radiat Oncol Biol Phys. 1997 Oct 1;39(3):545-52. doi: 10.1016/s0360-3016(97)00332-5.Int J Radiat Oncol Biol Phys. 1997.PMID: 9336130Clinical Trial.