Depression, anxiety and physical function: exploring the strength of causality
Bauke T Stegenga, Irwin Nazareth, Francisco Torres-González, Miguel Xavier, Igor Švab, Mirjam I Geerlings, Christian Bottomley, Louise Marston, Michael King
J Epidemiol Community Health Jul 2012, 66 (7) e25; DOI: 10.1136/jech.2010.128371