@article{Ullmann2011Healthier before they migrate, less healthy when they return? The health of returned migrants in Mexico,
author = {Ullmann, S.H. and Goldman, N. and Massey, D.S. },
title= {Social Science and Medicine },
year = {2011Healthier before they migrate, less healthy when they return? The health of returned migrants in Mexico},
doi = {10.1016/j.socscimed.2011.05.037},
journal = {73},
volume = {3},
number = {421–428},
}