Scatter plot: Each circle stands for a hospital. Its area correlates with the number of hip joint endoprostheses implantations of the persons insured at TK. The abscissa shows the annual number of cases according to BQS . Those hospitals with integrated health care contracts with TK for endoprosthetic care are marked in red.
Linder et al. BMC Musculoskeletal Disorders 2012 13:223 doi:10.1186/1471-2474-13-223