Beijing Children Hospital Group Co. Ltd.

The purpose of this study:(1) Development of a new risk classification model for childhood medulloblastoma. (2) Evaluation and improvement of existing individualized treatment protocols.

A prospective, randomized, multicenter, open-label, parallel-arm Study to compare effectiveness of mycophenolate mofetil versus cyclophosphamide in the Induction Therapy of pediatric patients with Active Proliferative Lupus Nephritis in Chinese population

The investigators expect to reveal the association between air pollution and childhood respiratory diseases through a multi-center observational study, and summarize the relationship between air pollution and childhood respiratory diseases.