Jefferis, B. J., Sartini, C., Ash, S., Lennon, L. T., Wannamethee, S. G., & Whincup, P. H. (2016). Validity of questionnaire-based assessment of sedentary behaviour and physical activity in a population-based cohort of older men; comparisons with objectively measured physical activity data. Int J Behav Nutr Phys Act.

Jefferis, Barbara J., Claudio Sartini, Sarah Ash, Lucy T. Lennon, S. Goya Wannamethee, und Peter H. Whincup. "Validity of Questionnaire-based Assessment of Sedentary Behaviour and Physical Activity in a Population-based Cohort of Older Men; Comparisons With Objectively Measured Physical Activity Data." Int J Behav Nutr Phys Act 2016.

Jefferis, Barbara J., et al. "Validity of Questionnaire-based Assessment of Sedentary Behaviour and Physical Activity in a Population-based Cohort of Older Men; Comparisons With Objectively Measured Physical Activity Data." Int J Behav Nutr Phys Act 2016.