1. Fair allocation of scarce medical resources in the time of covid-19;Emanuel;N Engl J Med,2020
2. Centers for Disease Control and Prevention. Interim updated planning guidance on allocating and targeting pandemic influenza vaccine during an influenza pandemic. Available at:https://www.cdc.gov/flu/pandemic-resources/national-strategy/planning-guidance/index.html. Accessed May 7, 2020.
3. Optimizing influenza vaccine distribution;Medlock;Science,2009
4. We know crowding affects the spread. it may affect the death rate;Rubin;New York Times,2020
5. The Cutter incident, 50 years later;Offit;N Engl J Med,2005