We've put you, the patient, at the centre of this investigation. Nine weeks ago we placed a call out, across ABC programs and social media, asking you to send us your bills. Hundreds of people across the country responded. In this joint Four Corners investigation with Dr Norman Swan from RN's Health Report, the program examines what's driving these out of pocket expenses. "The results are shocking and certainly show how out of pocket expenses are undermining the Australian private health care system."