Hansell Anna L, Gulliver John, Beevers Sean, Elliott Paul
UK Small Area Health Statistics Unit, MRC-PHE Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London W2 1PG, UK.
BMJ. 2013 Nov 19;347:f6795. doi: 10.1136/bmj.f6795.