Strengths and weaknesses of the study. 
To our knowledge, this is the first study comparing the ENT surgical volume between Covid-19 pandemic and a comparable period from the previous year. Our 3 different units are a good sample of the global ENT surgery activity in the Parisian region. Unfortunately, endonasal surgery only represented 10% of our overall activity in 2019, but the fact that only 5 endonasal procedures were performed in 2020 is enough to attest the strong decrease in terms of volume of this surgery.
In addition, this data can be very useful for the post-crisis management and if another crisis occurs later.