TOPIC: (Omalizumab OR "Xolair" OR "Anti-IgE Antibody" OR "Anti-IgE Antibodies" OR "Anti-IgE") AND TOPIC: ("Immunotherapy" OR Desensitization, Immunologic OR "Allergen Immunotherapy" OR "desensitization" OR "Desensitize") AND TOPIC: (Food OR "Peanut" OR "Peanuts") AND TOPIC: ("Long-term" OR "Sustained")