@article{Campbell2000,
author = {Campbell, M. and Fitzpatrick, R. and Haines, A. and Kinmonth, A. and Sandercock, P. and Spiegelhalter, D. and Tyrer, P.},
title= {Framework for design and evaluation of complex interventions to improve health},
year = {2000},
doi = {10.1136/bmj.321.7262.694},
journal = {British Medical Journal},
volume = {321},
pages = {694--696},
}