Flu Near You: Crowdsourced Symptom Reporting Spanning 2 Influenza Seasons. - Smolinski, Mark S.; Crawley, Adam W.; Baltrusaitis, Kristin; Rumi Chunara; Olsen, Jennifer M.; Wójcik, Oktawia; Santillana, Mauricio; Nguyen, Andre; Brownstein, John S. (American Journal of Public Health, 2015)