Althouse, B. M., S. V. Scarpino, L. A. Meyers, J. W. Ayers, M. Bargsten, J. Baumbach, J. S. Brownstein, et al. 2016. “Enhancing disease surveillance with novel data streams: challenges and opportunities.” EPJ data science 4 (1): 17. doi:10.1140/epjds/s13688-015-0054-0. http://dx.doi.org/10.1140/epjds/s13688-015-0054-0.