Potential use of ozone in SARS-CoV-2 / COVID-19. Official Expert Opinion of the International Scientific Committee of Ozone Therapy (ISCO3). ISCO3/EPI/00/04 (March 14, 2020). Approved by ISCO3 on 13/03/2020.Original drafters of the paper: Adriana Schwartz, Scientific Secretary of ISCO3, Gregorio Martínez-Sánchez, President of ISCO3.