Global Oxygen Therapy Equipment Market Trends, Size, By Product Type (Bag-Valve Mask and Oxygen Source Equipment), By Portability (Portable and Stationary), By Application (Asthma, Pneumonia, Chronic Obstructive Pulmonary Disease (COPD), Respiratory Distress Syndrome, Cystic Fibrosis, and Others), By Region (North America, Latin America, Europe, Asia Pacific, Middle East, and Africa): Global Oppor