1. Organisation of Economic Co-operation and Development201902222019-04-15Health at a Glance 2017
http://www.oecd.org/health/health-systems/health-at-a-glance-19991312.htm
2. DeloitteHCÄrzteblatt20142019-04-15[Auditors expect a lack of hospital beds from 2020 onwards]
https://www.aerzteblatt.de/nachrichten/58645/Wirtschaftspruefer-erwarten-Bettenmangel-im-Krankenhaus-ab-2020
3. Correction: Age-Related Variation in Health Status after Age 60