https://www.ncbi.nlm.nih.gov/books/NBK605502/
Authors. National Academies of Sciences, Engineering, and Medicine
Venue. Summary chapter via NCBI Bookshelf
How the Institute flags it
established 2 times speculative 1 time
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.