 Yeah. So now this differs by the type of health care worker you are. So it's going to be different for nurses versus physicians. But since we're talking about physicians, let's stick with that. States have the power to give you the license to practice medicine. And so in order to get that license, you need to pass all medical exams and then you need to complete a three year residency training, which people like Mark Costa have already completed in another country. But the U.S. says we want you to study our medical system.