1. Pharmapproach. List of pharmaceutical companies in United States of America – pharmapproach. Pharmapproach.com; 2020. Available from: www.pharmapproach.com/list-of-pharmaceutical-companies-in-united-states-of-america/14/. Accessed March 15, 2021.
2. Munos B. 2018 new drugs approvals: an all-time record, and a watershed. Forbes, Forbes Magazine; 2019. Available from: www.forbes.com/sites/bernardmunos/2019/01/14/2018-new-drugs-approvals-an-all-time-record-and-a-watershed/. Accessed March 15, 2021.
3. Center for Drug Evaluation and Research. New Drug Therapy Approvals 2019. U.S. Food and Drug Administration, FDA. Available from: www.fda.gov/drugs/new-drugs-fda-cders-new-molecular-entities-and-new-therapeutic-biological-products/new-drug-therapy-approvals-2019. Accessed March 15, 2021.
4. Center for Drug Evaluation and Research. Development of opioids in pediatric patients: conclusions. U.S. Food and Drug Administration, FDA. Available from: www.fda.gov/media/107946/. Accessed March 15, 2021.
5. The challenge of developing pain medications for children: therapeutic needs and future perspectives