A New Influenza-Tracking Smartphone App (Flu-Report) Based on a Self-Administered Questionnaire: Cross-Sectional Study

Kazutoshi Fujibayashi   ^{1 *} , MD, PhD ;   Hiromizu Takahashi   ^{1 *} , MD, PhD ;   Mika Tanei   ^{1 *} , MD, PhD ;   Yuki Uehara   ^{1 *} , MD, PhD ;   Hirohide Yokokawa   ¹ , MD, PhD ;   Toshio Naito   ¹ , MD, PhD

¹ Department of General Medicine, School of Medicine, Juntendo University, Tokyo, Japan

*these authors contributed equally