https://cryonics.miraheze.org/wiki/21st_Century_Medicine
Venue. Cryonics Wiki entry (community-maintained)
How the Institute flags it
established 3 times frontier 2 times
This source carries more than one flag across the corpus. That is not an inconsistency to resolve: the same work can be established evidence for one claim and frontier evidence for another, and the flag belongs to the use rather than to the source.