Retraction note: A novel IoT–fog–cloud-based healthcare system for monitoring and predicting COVID-19 outspread (The Journal of Supercomputing, (2022), 78, 2, (1783-1806), 10.1007/s11227-021-03935-w)

The Editor-in-Chief and the publisher have retracted this article. An investigation by the publisher found a number of concerns, including but not limited to citations which do not support claims made in the text, non-standard phrasing, and image irregularities. Based on the investigation’s findings the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article. The authors disagree with this retraction.