Detection of Spatiotemporal Clusters of COVID-19–Associated Symptoms and Prevention Using a Participatory Surveillance App: Protocol for the @choum Study

David De Ridder   ^{1, 2, 3, 4 *} , PhD ;   Andrea Jutta Loizeau   ^{1, 2 *} , PhD ;   José Luis Sandoval   ^{3, 5} , MD, PhD ;   Frédéric Ehrler   ⁶ , PhD ;   Myriam Perrier   ⁶ , MSc ;   Albert Ritch   ⁶ , MSc ;   Guillemette Violot   ⁷ , MSc ;   Marc Santolini   ⁸ , PhD ;   Bastian Greshake Tzovaras   ⁸ , PhD ;   Silvia Stringhini   ^{1, 2} , PhD ;   Laurent Kaiser   ^{2, 9, 10} , MD, PhD ;   Jean-François Pradeau   ⁶ , MSc ;   Stéphane Joost   ^{3, 4} , PhD ;   Idris Guessous   ^{1, 2, 3, 4} , MD, PhD

¹ Division of Primary Care, Geneva University Hospitals, Geneva, Switzerland

² Department of Health and Community Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland

³ Group of Geographic Information Research and Analysis in Population Health, Geneva University Hospitals, Geneva, Switzerland

⁴ Laboratory of Geographic Information Systems, School of Architecture, Civil and Environmental Engineering, Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland

⁵ Department of Oncology, Geneva University Hospitals, Geneva, Switzerland

⁶ Direction of Information Systems, Geneva University Hospitals, Geneva, Switzerland

⁷ Communication Directorate, Geneva University Hospitals, Geneva, Switzerland

⁸ Center for Research and Interdisciplinarity, INSERM U1284, University of Paris, Paris, France

⁹ Division of Infectious Disease and Laboratory of Virology, Geneva University Hospitals, Geneva, Switzerland

¹⁰ Center for Emerging Viral Diseases, Geneva University Hospitals, Geneva, Switzerland

*these authors contributed equally