“…density of alcohol outlets across Scottish ‘Data Zones’ ( Ellaway et al, 2010 ), fast food outlet density at Australian ‘Local Government Area’ ( Thornton et al, 2016 ), density of tobacco outlets at Canadian ‘Public Health Unit’ level ( Chaiton et al, 2013 ), or gambling outlet density within US ‘Census Tracts’ ( Wiggins et al, 2010 ). The benefit of this approach was the potential to link these boundaries to additional key data such as poverty rates ( Ellaway et al, 2010 , Thornton et al, 2016 ), indicators of urbanicity/rurality ( Thornton et al, 2016 ), population ethnicity ( Wiggins et al, 2010 ), or number of smokers ( Chaiton et al, 2013 ). The cluster analysis approach applied within our paper has previously been used to detect geographic disparities in the incidence of disease cases, e.g.…”