<qa>  What is the activity index for adult and pediatric patients with Eosinophilic Esoph1. Introduction Coordinated by the Swiss Eosinophilic Esophagitis Research Group and in close collaboration with The International Gastrointestinal Eosinophil Researchers TIGERS, we plan to conduct a series of related studies in order to develop an Activity Index AI for adult and pediatric patients with Eosinophilic Esophagitis EoE. 