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.
Valantine HA, Hunt SA, Gibbons R, Billingham ME, Stinson EB, Popp RL.Valantine HA, et al. Among authors: gibbons r.Circulation. 1989 Mar;79(3):603-9. doi: 10.1161/01.cir.79.3.603.Circulation. 1989.PMID: 2645065
Valantine HA, Hatle LK, Appleton CP, Gibbons R, Popp RL.Valantine HA, et al. Among authors: gibbons r.J Am Soc Echocardiogr. 1990 Jul-Aug;3(4):276-84. doi: 10.1016/s0894-7317(14)80310-6.J Am Soc Echocardiogr. 1990.PMID: 2206544Free article.