RT Journal Article SR Electronic T1 1 Billion Steps Challenge sign-ups in full swing: Competition culminates during National Public Health Week JF The Nation's Health JO Nations Health FD American Public Health Association SP 3 OP 3 VO 48 IS 1 A1 Wahowiak, Lindsey YR 2018 UL http://www.thenationshealth.org/content/48/1/3.2.abstract AB