1. IQVIA. The global use of medicine in 2019 and outlook to 2023. https://www.iqvia.com/insights/the-iqvia-institute/reports/the-global-use-of-medicine-in-2019-and-outlook-to-2023 (Accessed December 27, 2019).
2. IQVIA. Global oncology trends 2019. https://www.iqvia.com/insights/the-iqvia-institute/reports/global-oncology-trends-2019 (Accessed December 27, 2019).
3. Kamal, R., Cox, C. & McDermott, D. What are the recent and forecasted trends in prescription drug spending? https://www.healthsystemtracker.org/chart-collection/recent-forecasted-trends-prescription-drug-spending/#item-percent-of-total-rx-spending-by-oop-private-insurance-and-medicare_nhe-projections-2018-27 (Accessed December 31, 2019).
4. Siddiqui, M. & Rajkumar, S. V. The high cost of cancer drugs and what we can do about it. Mayo Clinic Proc. 87, 935–943 (2012).
5. Kantarjian, H. & Rajkumar, S. V. Why are cancer drugs so expensive in the United States, and what are the solutions? Mayo Clinic Proc. 90, 500–504 (2015).