I would just like to add that Dr. Krewski's team at the University of Ottawa is part of the national population group of studies. His work is looking at risk of onset and prognostic factors, and as Dr. Kaplan has said, has looked at environmental factors that influence diseases, looking at international literature reviews and at some newer studies related to that as well.
To go back to your previous question just briefly, with regard to misdiagnosis of Parkinson's versus essential tremors, three of our teams within the national study are looking at validating algorithms for case definitions for neurological conditions, looking at the ICD-9 and ICD-10 codes, and looking at the feasibility of having neurological conditions added to the Canadian chronic disease surveillance system.
So they're really looking at each of these codes and finding a good way to have these codes used by doctors correctly. They're finding that they're used a lot better at hospitals than they are within physicians' offices.
These studies are trying to find a good common way of making sure that those misdiagnoses don't happen and inflate incidence numbers.