The Interphone study was a multinational study. I forget how many countries were involved; Canada was involved, as were many other countries. It was released this past May.
It took place over 10 years and looked specifically at whether cellphones increased the risk of brain tumours. The results showed that there was not evidence that conclusively said, yes, the risk of brain tumours was increased, but it did recommend that longer-term studies be conducted, specifically on children.
As most of us know, cellphone use didn't really become widespread until the nineties, so children have not been exposed for that long.
So longer-term studies were warranted and Canada will hopefully participate.