Spirometer Market Size, Share & COVID-19 Impact Analysis, By Product Type (Devices, Software, Accessories & Consumables), By Type (Volume Measurement and Peak Flow Meters), By Application (Chronic Obstructive Pulmonary Disorder (COPD), Asthma, and Others), By End User (Hospitals, Diagnostic Centers, Homecare Settings, Physician/Primary Care Offices or Clinics, and Other Facilities), and Regional Forecasts, 2021-2028