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.
Atkinson JL, Sallis JF, Saelens BE, Cain KL, Black JB.Atkinson JL, et al. Among authors: saelens be.Am J Health Promot. 2005 Mar-Apr;19(4):304-9. doi: 10.4278/0890-1171-19.4.304.Am J Health Promot. 2005.PMID: 15768925
Crespo NC, Sallis JF, Conway TL, Saelens BE, Frank LD.Crespo NC, et al. Among authors: saelens be.Am J Health Promot. 2011 Mar-Apr;25(4):264-71. doi: 10.4278/ajhp.081112-QUAN-280.Am J Health Promot. 2011.PMID: 21361812