How would the poor obtain medical care in a free society?

In your May 12th, 2013 show, you discussed how EMTALA -- the law that obliges emergency rooms and doctors to treat patients, regardless of ability to pay -- violates the rights of doctors and results in worse care for the poor. But what is the alternative? How would the poor and indigent get medical care -- if at all -- in a society without government welfare programs? What if charity wasn't sufficient?