@article{van der Lee2007,
author = {van der Lee, J.H. and Mokkink, L.W. and Grootenhuis, M.A. and Heymans, H.S. and Offringa, M.},
title= {Definitions and measurement of chronic health conditions in childhood: A systematic review},
year = {2007},
doi = {10.1001/jama.297.24.2741},
journal = {JAMA },
volume = {297},
number = {24},
pages = {2741--2751},
}