PT - JOURNAL ARTICLE AU - Mark Barna TI - Hundreds of teams in Billion Steps Challenge: APHA’s steps challenge part of National Public Health Week DP - 2020 Feb 01 TA - The Nation's Health PG - 3--3 VI - 50 IP - 1 4099 - http://www.thenationshealth.org/content/50/1/3.2.short 4100 - http://www.thenationshealth.org/content/50/1/3.2.full SO - Nations Health2020 Feb 01; 50