Blümel, M., Röttger, J., Köppen, J., Achstetter, K., Busse, R. (2020). 'Integrating the Population Perspective into Health System Performance Assessment (IPHA): Study Protocol for a Cross-Sectional Study in Germany Linking Survey and Claims Data of Statutorily and Privately Insured', International Journal of Health Policy and Management, 9(9), pp. 370-379. doi: 10.15171/ijhpm.2019.141