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.
Frost F, Nanninga J, Penn R, Savoy S, Wu Y.Frost F, et al. Among authors: penn r.Am J Phys Med Rehabil. 1989 Jun;68(3):112-5.Am J Phys Med Rehabil. 1989.PMID: 2730779
Latash ML, Penn RD, Corcos DM, Gottlieb GL.Latash ML, et al. Among authors: penn rd.Exp Neurol. 1989 Feb;103(2):165-72. doi: 10.1016/0014-4886(89)90078-2.Exp Neurol. 1989.PMID: 2912760
Parke B, Penn RD, Savoy SM, Corcos D.Parke B, et al. Among authors: penn rd.Arch Phys Med Rehabil. 1989 Jan;70(1):30-2.Arch Phys Med Rehabil. 1989.PMID: 2916915
Latash ML, Penn RD, Corcos DM, Gottlieb GL.Latash ML, et al. Among authors: penn rd.J Neurosurg. 1990 Mar;72(3):388-92. doi: 10.3171/jns.1990.72.3.0388.J Neurosurg. 1990.PMID: 2303873