@article{Gu_2020,
title={Association of COVID-19 Infections in San Francisco in Early March 2020 with Travel to New York and Europe},
url={http://dx.doi.org/10.1101/2020.04.04.20053629},
DOI={10.1101/2020.04.04.20053629},
publisher={Cold Spring Harbor Laboratory},
author={Gu,
Wei and Reyes,
Kevin and Hsu,
Elaine and Miller,
Steve and Chiu,
Charles},
year={2020},
month=apr }