There are 2 studies that match your criteria (1 of which are reviews, comments, or miscellaneous).
Criteria: Study Type=Literature Review, Letter, Book Chapt., Report,Freq Range=300 kHz - 300 GHz (RF/mmW/THz),Study Subtype=Co-exposure of RFR and other agents

View This Study - Citation No: 8608 (Literature Review)
Title	Evidence for a Connection between Covid-19 and Exposure to Radiofrequency Radiation from Wireless Communications Including 5G.
Reference	Journal of Clinical and Translational Research. , Vol. 7, Pg. 666 - 681, 2021
Author(s)	Rubik B., Brown R. R.
PubMed UID	34778597
Project ID	3042
View This Study - Citation No: 8609
Title	The Conspiracy of Covid-19 and 5G: Spatial Analysis Fallacies in the Age of Data Democratization.
Reference	Social Science & Medicine., Vol. 293, Pg. 114546 - , 2022
Author(s)	Flaherty E., Strum T., Farries E.
PubMed UID	https://doi.org/10.1016/j.socscimed.2021.114546
Project ID	3042