Dena M. Bravata, Crystal Smith-Spangler, Vandana Sundaram, Allison L. Gienger, Nancy Lin, Robyn Lewis, Christopher D. Stave, Ingram Olkin, John R. Sirard,
Using Pedometers to Increase Physical Activity and Improve Health: A Systematic Review JAMA. ,vol. 298, pp. 2296- 2304 ,(2007) ,
10.1001/JAMA.298.19.2296