Is Stimulation of the Tragus as Effective as Stimulation of the Cymba Concha in TAVNS?

In this letter

the authors make the case that tragus stimulation may be as effective as cymba concha.  This would be helpful since the tragus is so much easier to use a clip on.  Filing here for info.

Though the tragus may not have the same density of fibers, they may be easier to reach, so equally if not more effective.  I like to think it true.