@article{Howe2016,
author = {Howe, C.J. and Cole, S.R. and Lau, B. and Napravnik, S. and Eron Jr., J.J. },
title= {Selection bias due to loss to follow up in cohort studies},
year = {2016},
doi = {10.1097/EDE.0000000000000409},
volume = {27},
number = {1},
pages = {91--97},
}