Describe significant US healthcare tourism benefits and challenges. For example what medical procedure industry sectors (e.g Neurology)are growing?

What medical procedure industry sectors are growing slowly, not at all, or contracting?

what impact does the US insurance system have on medical tourism (people coming to the United States/ People coming from the United States)?

What are the major challenges in the United States medical tourism and what benefits does the United States provide the medical tourism industry?

Because of what factors is the United States considered a leader in medical tourism?