@incollection{Fraga12,
author = {Susana Silva and Sílvia Fraga},
title = {Qualitative Research in Epidemiology},
booktitle = {Epidemiology},
publisher = {IntechOpen},
address = {Rijeka},
year = {2012},
editor = {Nuno Lunet},
chapter = {4},
doi = {10.5772/32986},
url = {https://doi.org/10.5772/32986}
}