That is very much a concern with these studies (one that is not well addressed by the study authors). Healthcare Triage has a great video on this topic: https:

That is very much a concern with these studies (one that is not well addressed by the study authors). Healthcare Triage has a great video on this topic: https://www.youtube.com/watch?v=1JkFN_2mzR4 https://www.youtube.com/watch?v=1JkFN_2mzR4