@article{Duncan1998,
author = {Duncan, C. and Jones, K. and Moon, G.},
title= {Context, composition and heterogeneity: using multilevel models in health research},
year = {1998},
doi = {10.1016/S0277-9536(97)00148-2},
journal = {Social Science & Medicine},
volume = {46},
number = {1},
pages = {97--117},
}