@article{Tong2015,
author = {Tong, Y. and Luo, W. and Piotrowski, M.},
title= {The association between parental migration and childhood illness in rural China},
year = {2015},
doi = {10.1007/s10680-015-9355-z},
volume = {31},
number = {5},
pages = {561--586},
}