title: Measuring physical activity among pregnant women using a structured one-week recall questionnaire: evidence for validity and reliability.
authors.affiliation: Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA. kelly_evenson@unc.edu.
authors.forename: Kelly R
authors.initials: KR
authors.lastname: Evenson
authors.forename: Fang
authors.initials: F
authors.lastname: Wen