I don't expect to be annoying here, but I clearly understand that the term free, in this context, means everyone can go to a medical center and be attended without providing an account or a credit card. Obviously people are paying for that, but not only the person who is in the hospital. So, in some sense, it is "free"... But doctors are being paid, hospital location, equipment.... In Brazil you will never receive a bill for the ambulance or the surgery you made in public system.