@article {McDonaldBien2021, title = {Can Auxiliary Indicators Improve COVID-19 Forecasting and Hotspot Prediction?}, journal = {Proceedings of the National Academy of Sciences}, volume = {118}, year = {2021}, pages = {e2111453118}, url = {https://doi.org/10.1073/pnas.2111453118}, author = {McDonald, Daniel J and Bien, Jacob and Green, Alden and Hu, Addison J and DeFries, Nat and Hyun, Sangwon and Oliveira, Natalia L and Sharpnack, James and Tang, Jingjing and Tibshirani, Robert and Ventura, Val{\'e}rie and Wasserman, Larry and Tibshirani, Ryan J} }