Retraction Note: Diagnosis and combating COVID-19 using wearable Oura smart ring with deep learning methods (Personal and Ubiquitous Computing, (2022), 26, 1, (25-35), 10.1007/s00779-021-01541-4)

The Publisher has retracted this article in agreement with the Editor-in-Chief. The article was submitted to be part of a guest-edited issue. An investigation by the publisher found a number of articles, including this one, with a number of concerns, including but not limited to compromised editorial handling and peer review process, inappropriate or irrelevant references or not being in scope of the journal or guest-edited issue. Based on the investigation’s findings, the publisher, in consultation with the Editor-in-Chief, therefore no longer has confidence in the results and conclusions of this article. Author M. Poongodi disagrees with this retraction and has stated that author Mounir Hamdi disagrees with this retraction. Authors Ashutosh Sharma and Gaurav Dhiman disagree with this retraction. Author S. Vimal has not responded to correspondence regarding this retraction. The Publisher has not been able to obtain a current email address for author Mohit Malviya.