Tirelli, Umberto, Cinzia Cirrito, and Martina Pavanello. “Ozone Therapy Is an Effective Therapy in Chronic Fatigue Syndrome: Result of an Italian Study in 65 Patients”. Ozone Therapy 3, no. 2 (September 13, 2018). Accessed August 8, 2020. https://www.pagepressjournals.org/index.php/ozone/article/view/7812.