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2. US FDA. Designating an orphan product: drugs and biological products(2022). www.fda.gov/industry/developing-products-rare-diseases-conditions/designating-orphanproduct-drugs-and-biological-products
3. US FDA. Prescription drug user fee act waivers reductions and refunds for drug and biological products guidance for industry (2022) www.fda.gov/media/131797/download
4. US FDA. Orphan products grants program (2022). www.fda.gov/industry/developing-products-rare-diseases-conditions/orphan-products-grants-program#:~:text=The%20FDA's%20Orphan%20Products%20Grants for%20patients%20with%20rare%20disease
5. IQVIA Institute for Human Data Science. Orphan drugs in the United States: rare disease innovation and cost trends through 2019 (2020). www.iqvia.com/insights/the-iqvia-institute/reports/orphan-drugs-in-the-united-states-rare-disease-innovation-and-cost-trends-through-2019