TY - JOUR T1 - NPHW challenge participants log more than 2.2 billion steps JF - The Nation's Health JO - Nations Health SP - 14 LP - 14 VL - 47 IS - 4 AU - Lindsey Wahowiak Y1 - 2017/06/01 UR - http://www.thenationshealth.org/content/47/4/14.abstract N2 - In its second year, APHA’s 1 Billion Steps Challenge surpassed expectations. ER -