Welcome to the Home Page of Private Doctors of Australia and to the world of medical politics. Private Doctors of Australia Ltd (PDA) is the only free market medical organization in Australia. Established in 1968 as the General Practitioners' Society in Australia (GPSA), PDA has been the only medical body to consistently oppose the involvement of government in the practice of medicine. PDA is not aligned with any political party and receives no financial assistance either from government or from any political party.