title: Physical activity environment measurement and same source bias.
authors.affiliation: Social and Cardiovascular Epidemiology Research Group, School of Medicine, University of Alcalá, Madrid, Spain; Escuela Nacional de Sanidad, Instituto de Salud Carlos III, Madrid, Spain.
authors.forename: Pedro
authors.initials: P
authors.lastname: Gullón
authors.affiliation: Social and Cardiovascular Epidemiology Research Group, School of Medicine, University of Alcalá, Madrid, Spain; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, MD, USA.
authors.forename: Usama
authors.initials: U
authors.lastname: Bilal
authors.affiliation: Social and Cardiovascular Epidemiology Research Group, School of Medicine, University of Alcalá, Madrid, Spain; Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, MD, USA; Department of Epidemiology, Atherothrombosis and Cardiovascular Imaging, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain. Electronic address: mfranco@uah.es.
authors.forename: Manuel
authors.initials: M
authors.lastname: Franco
mesh_terms: D004777:Environment; D005260:Female; D006798:Housing; D006801:Humans; D007899:Leisure Activities; D008297:Male; D009043:Motor Activity; D012111:Residence Characteristics; D014186:Transportation