Europe Allergy Immunotherapies Market Forecast to 2027- COVID-19 Impact and Global 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 Country