>We know that the doctor and nurse brain-drain from Canada to the US has been ongoing for decades.

Its actually the opposite: it had been going on for some time, but has reversed for decades, and in recent years Canada has had _increasing gains_ of medical professionals from the US.

>The Canadian Institute for Health Information (CIHI) reports annually on the number of physicians moving abroad and returning to active practice in Canada (CIHI 1996–2005). In the early to mid-1990s, net losses averaged 400 per year. More recently, the number of physicians leaving Canada has decreased significantly, resulting in net gains of between 30 to 60 per year. https://pmc.ncbi.nlm.nih.gov/articles/PMC2645159/#:~:text=Th...