Corrado, A., T. Renda, and S. Bertini. “Long-Term Oxygen Therapy in COPD: Evidences and Open Questions of Current Indications”. Monaldi Archives for Chest Disease 73, no. 1 (January 19, 2016). Accessed April 20, 2024. https://www.monaldi-archives.org/macd/article/view/311.