It's done by surgeon, actually. The surgeon and the province they're in are what I've used as the identifier, and then it has all the information about that specific case, the type of implant, when it was put in, when it was taken out, what the symptoms were, any imaging, what the pathology was, what the treatment was and what the outcome was. It's really robust, and that was the challenge.
In the most recent call I had with Health Canada, the challenge was that their data is not as robust. It's unclear how they capture it, and they weren't willing to share it just so that we could look at it and see how it compares to our data.