PT - JOURNAL ARTICLE AU - Michele Late TI - Steps challenge participants log more than 2 billion steps DP - 2018 Jun 01 TA - The Nation's Health PG - 16--16 VI - 48 IP - 4 4099 - http://www.thenationshealth.org/content/48/4/16.3.short 4100 - http://www.thenationshealth.org/content/48/4/16.3.full SO - Nations Health2018 Jun 01; 48