North America Allergy Immunotherapies Market to Forecast to 2027- COVID-19 Impact and Analysis- By Treatment (Subcutaneous Immunotherapy (SCIT) and Sublingual Immunotherapy (SLIT)), Allergy type (Allergic Rhinitis, Asthma, Food Allergy, Venom Allergy, and Others), Distribution Channel (Hospital Pharmacy, Retail Pharmacy, and Online Pharmacy) and Geography