Global Allergy Treatment Market - Global Industry Size, Share, Trends, Opportunity, and Forecast, 2017-2027 Segmented By Type (Eye Allergy, Food Allergy, Skin Allergy, Asthma, Rhinitis, Others), By Treatment (Anti-Allergy Medications v/s Immunotherapy), By Route of Administration (Oral, Inhalers, Intranasal, Others), By Distribution channel (Hospital Pharmacies, Retail Pharmacies, Online Pharmacie