العمل الإجرائي للأمراض التنفسية

- المراجع

• National Institutes of Health (NIH): https://www.nih.gov/
• Centers for Disease Control and Prevention (CDC): https://www.cdc.gov/
• World Health Organization (WHO): https://www.who.int/about
• Chronic Obstructive Pulmonary Disease (COPD): https://www.copdfoundation.org/What-is-COPD/Understanding-COPD/What-is-COPD.aspx
• American Journal of Respiratory and Critical Care Medicine: https://www.atsjournals.org/journal/ajrccm