1. The epidemiology of ocular and nasal allergy in the United States, 1988–1994;Singh;J Allergy Clin Immunol,2010
2. Ocular and nasal allergy symptom burden in America: the Allergies, Immunotherapy, and Rhinoconjunctivitis (AIRS) Surveys;Bielory;Allergy Asthma Proc,2014
3. Pew Internet and American Life Project. Health online 2013. http://www.pewinternet.org/Reports/2013/Health-online/Summary-of-Findings.aspx. Accessed July 29, 2013.
4. Monthly US search engine rankings. 2013. http://www.comscore.com/Insights/Press_Releases/2013/7/comScore_Releases_June_2013_U.S._Search_Engine_Rankings. Accessed August 1, 2013.
5. Detecting influenza epidemics using search engine query data;Ginsberg;Nature,2009