Those many places we know of so far for Anavex is Australia and Sweden, if of course we discount North American as a dark place.
Are different folks more susceptible to placebo and is there a placebo gene? Do investigators behave differently in different cultures or perhaps both?
Massive and unexpected placebo response is a rotten problem for clinical trials that I have seen before. It can loose you a good investment :-)
The most interesting facet of this, to me at least, is how might we harness the placebo and even the so called nocebo effect.