@article{Boyle2011,
author = {Boyle, P.J. and Feng, Z. and Raab, G.M.},
title= {Does widowhood increase mortality risk? Testing for selection effects by comparing causes of spousal death},
year = {2011},
doi = {10.1097/EDE.0b013e3181fdcc0b},
journal = {Epidemiology},
volume = {22},
number = {1},
pages = {1--5},
}