TY - JOUR T1 - Physical activity environment measurement and same source bias JO - Gaceta Sanitaria T2 - AU - Gullón,Pedro AU - Bilal,Usama AU - Franco,Manuel SN - 02139111 M3 - 10.1016/j.gaceta.2013.12.011 DO - 10.1016/j.gaceta.2013.12.011 UR - https://gacetasanitaria.org/es-physical-activity-environment-measurement-same-articulo-S0213911114000077 ER -