https://www.who.int/publications/i/item/9789240025233
Authors. World Health Organization
Venue. second edition
How the Institute flags it
frontier 2 times established 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.