The information below is entirely based on the authoritative medical reference The Washington Manual of Allergy, Asthma, and Immunology , 2nd Edition (2013), edited by Dr. Shirley Joo and Dr. Andrew L. Kau—both prominent experts in allergy and clinical immunology at Washington University School of Medicine in St. Louis, USA. This publication is the collaborative work of numerous physicians, educators, and researchers with extensive clinical and academic experience, combining