1. Auditor General DePasquale Demands Increased Oversight of Pharmacy Benefit Managers that Impact Drug Prices,2018
2. Auditor's Report: Pharmacy Benefit Managers Take Fees of 31% on Generic Drugs Worth $208M in One-Year Period,2018
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4. United States Securities and Exchange Commission. Fiscal Year End December 31;Express Scripts Holding Company Form 10-K,2017
5. Examining pharmaceutical benefits in the United States—a framework;Chan;JAMA Health Forum,2020