Enbrel-Juvenile Idiopathic Arthritis (JIA) Use Results Survey [All-Case Surveillance]

This surveillance is conducted to survey the followings under the post marketed drug utilization on the patients who are administrated ENBREL as a treatment for active polyarticular JIA. 1. Primary Occurrence status of Adverse Events; incidence of all adverse events, serious adverse events 2. Secondary Factors affecting safety and to confirm the efficacy such as DAS28.