Inclusion Criteria:  Patients over 18 years of age. Ones who underwent to a surgical intervention in the collection period, by the participating institutions. Both public and private institutions will be included. Patients with and without COVID-19 infection will be included.  Exclusion Criteria:  Patients who do not have the necessary clinical records to complete the information during data collection. Patients who do not approve inclusion in the study through informed consent. The following shall be excluded: Procedures that were performed outside of operating rooms. Radiological procedures. Endoscopic procedures.