I claim the "right" to speak freely and to travel freely. These are "natural" rights, because I can do them myself, and they do not inherently detract from any of your rights. It is certainly possible for me to speak or walk about without taking anything from you, or preventing you from doing the same. Unless I interpret my "right" to speak as requiring you to give me a stage and a microphone, and my "right" to travel as requiring you to give me a car and a road.
How, then, can "medicine" qualify as the same sort of "right" as speach? How can I have a "right" to surgery, unless some other person is forced to provide me a building, a surgeon's efforts, and equipment? A very interesting point made by one of my favorite geniuses, Walter Williams.