@article{Goldstein2002,
author = {Goldstein, H. and Browne, W. and Rasbash, J.},
title= {Multilevel modelling of medical data},
year = {2002},
doi = {10.1002/Sim.1264},
journal = {Statistics in medicine},
volume = {21},
number = {21},
pages = {3291--3315},
}