@article{Pfarr2012,
author = {Pfarr, C. and Schmid, A. and Schneider, U.},
title= {Reporting heterogeneity in self- assessed health among elderly Europeans},
year = {2012},
doi = {10.1186/2191-1991-2-21},
volume = {2},
number = {1},
pages = {21},
}