tones & perfect pitch...

...sorry if this is leaning toward off-topic, but some time ago I saw an
article (in _Time_ or something not particularly scientific) that
mentioned a study which showed that a very high proportion of
tone-language speakers ended up with perfect pitch.  Can anyone
confirm/deny this?  I don't speak any tonal languages (wish I did) and do
have perfect pitch--it would be interesting to have a society with lots
of perfect-pitched people, and have it interacting with poor "tone-deaf"
(from their POV?) people of another society....

Yoon Ha Lee, speculating
and hoping never to have to go to beginning string players' concerts again