Tilling Kate, Howe Laura D, Ben-Shlomo Yoav
School of Social and Community Medicine, University of Bristol and MRC Centre for Causal Analyses in Translational Epidemiology, School of Social and Community Medicine, University of Bristol, Bristol, UK.
Int J Epidemiol. 2011 Feb;40(1):250-2. doi: 10.1093/ije/dyq233. Epub 2011 Jan 7.