Medicine
Coronavirus disease 2019 (COVID-19)
Pandemic
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)
2019-20 coronavirus outbreak
Acute appendicitis
Cohort study
Cohort
Multicenter study
Surgery
Appendicitis
General surgery
Internal medicine
Infectious disease (medical specialty)
Virology
Disease
Randomized controlled trial
Outbreak
