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Impact of a Symptom Checker App on Patient-Physician Interaction Among Self-Referred Walk-In Patients in the Emergency Department: Multicenter, Parallel-Group, Randomized, Controlled Trial

Malte L Schmieding, Marvin Kopka, Myrto Bolanaki, Hendrik Napierala, Maria B Altendorf, Doreen Kuschick, Sophie K Piper, Lennart Scatturin, Konrad Schmidt, Claudia Schorr, Alica Thissen, Cornelia Wäscher, Christoph Heintze, Martin Möckel, Felix Balzer, Anna Slagman

J Med Internet Res 2025;27:e64028

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Effects of Face Mask Mandates on COVID-19 Transmission in 51 Countries: Retrospective Event Study

Anatol-Fiete Näher, Matthias Schulte-Althoff, Marvin Kopka, Felix Balzer, Francisco Pozo-Martin

JMIR Public Health Surveill 2024;10:e49307

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Characteristics of Users and Nonusers of Symptom Checkers in Germany: Cross-Sectional Survey Study

Marvin Kopka, Lennart Scatturin, Hendrik Napierala, Daniel Fürstenau, Markus A Feufel, Felix Balzer, Malte L Schmieding

J Med Internet Res 2023;25:e46231

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The Triage Capability of Laypersons: Retrospective Exploratory Analysis

Marvin Kopka, Markus A Feufel, Felix Balzer, Malte L Schmieding

JMIR Form Res 2022;6(10):e38977

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Triage Accuracy of Symptom Checker Apps: 5-Year Follow-up Evaluation

Malte L Schmieding, Marvin Kopka, Konrad Schmidt, Sven Schulz-Niethammer, Felix Balzer, Markus A Feufel

J Med Internet Res 2022;24(5):e31810

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Determinants of Laypersons’ Trust in Medical Decision Aids: Randomized Controlled Trial

Kopka and colleagues [33] found that most laypersons are certain in their urgency assessment and that in absolute numbers, laypersons make most errors when they are certain of their appraisal. For this reason, we also examined whether users tended to accept advice from such decision aids when they were already certain of their own judgment.

Marvin Kopka, Malte L Schmieding, Tobias Rieger, Eileen Roesler, Felix Balzer, Markus A Feufel

JMIR Hum Factors 2022;9(2):e35219

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