TY - JOUR TI - Differences in physical aging measured by walking speed: evidence from the English Longitudinal Study of Ageing DO - http://dx.doi.org/10.1186/s12877-016-0201-x SP - 1 EP - 9 UR - http://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-016-0201-x PY - 2016-01-01 JO - BMC Geriatrics AU - Weber, Daniela ER -