https://www.nature.com/articles/s41586-019-1192-5
Authors. Fredens, Wang, de la Torre, Funke, Robertson, Christova et al
Venue. Nature 569:514–518
How the Institute flags it
established 1 time frontier 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.