Performance of eHealth Data Sources in Local Influenza Surveillance: A 5-Year Open Cohort Study

Toomas Timpka   ¹ , MD, PhD ;   Armin Spreco   ¹ , MSc ;   Örjan Dahlström   ² , PhD ;   Olle Eriksson   ³ , PhD ;   Elin Gursky   ⁴ , PhD ;   Joakim Ekberg   ¹ , PhD ;   Eva Blomqvist   ³ , PhD ;   Magnus Strömgren   ⁵ , PhD ;   David Karlsson   ³ , MSc ;   Henrik Eriksson   ³ , PhD ;   James Nyce   ⁶ , PhD ;   Jorma Hinkula   ⁷ , PhD ;   Einar Holm   ⁵ , PhD

¹ Department of Medical and Health Sciences, Linköping University, Linköping, Sweden

² Department of Behavioural Sciences and Learning, Linköping University, Linköping, Sweden

³ Department of Computer and Information Science, Linköping University, Linköping, Sweden

⁴ National Strategies Support Directorate, ANSER/Analytic Services Inc., Arlington, VA, United States

⁵ Department of Geography and Economic History, Umeå University, Umeå, Sweden

⁶ Department of Anthropology, Ball State University, Muncie, IN, United States

⁷ Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden