@article{Cheung2019,
author = {Cheung, Y.T.D. and Weng, X. and Wang, M.P. and Ho, S.Y. and Kwong, A.C.S. and Lai, V.W.Y. and Lam, T.H.},
title= {Effect of prepaid and promised financial incentive on follow-up survey response in cigarette smokers: A randomized controlled trial},
year = {2019},
doi = {10.1186/s12874-019-0786-9},
volume = {19},
number = {138},
pages = {2--8},
}