I don't have a suggestion on WHO, but the topic is ancient and profound... yet kind-of lost on modern peeps. there has been a resurgence of interest and use over the past couple years so the audience is primed. you could couple the subject with other old school medicines. or couple it with 'the power of plants'. have you ever read 'the secret life of plants' by Tompkins written in the mid 70's. it's amazing how dismissive even moral people are of a good portion of the living creatures on this planet, especially plants.