Rett trial was done in USA. AD trial was done in Australia, NZ, Canada, UK, and EMA. PDD trial was done in EMA.
This means that each regulatory agency (FDA, EMA, Australian and NZ and Canadian and UK agencies) can point to safety and efficacy data that was gathered under their auspices and in their own country's clinics. This was very smart and clearly deliberate.
Anavex is looking to provide working therapies to patients globally, not simply to the US market alone.