@article{Grol-Prokopczyk2011,
author = {Grol-Prokopczyk, H. and Freese, J. and Hauser, R.M.},
title= {Using anchoring vignettes to assess group differences in general self-rated health},
year = {2011},
doi = {10.1177/0022146510396713},
volume = {52},
number = {2},
pages = {246--261},
}