jzelinskie Perhaps as a first step create one such lens yourself and share it here so others can share their thoughts?
My personal opinion is that since Mayo Clinic is an ad monetized website itt:
a) will have inherent conflict of interest (medical information presented will inherently be biased towards what their advertisers approve)
b) the purpose of the existence of content on its website is in not to inform and educate the reader but to maximize ad impressions.
So I am always cautious when we create any such lists and we try to include sites that do not run ads, affiliate links etc.