Association between questionnaire- and accelerometer-assessed physical activity: the role of sociodemographic factors. Sabia, S.; van Hees, V. T.; Shipley, M. J.; Trenell, M. I.; Hagger-Johnson, G.; Elbaz, A.; Kivimaki, M.; Singh-Manoux, A.. Am J Epidemiol.. 2014; 781-90: p.781-90Article