Study of Oral Upadacitinib and Subcutaneous/Intravenous Tocilizumab to Evaluate Change in Disease Activity, Adverse Events and How Drug Moves Through the Body of Pediatric and Adolescent Participants With Active Systemic Juvenile Idiopathic Arthritis.

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National Taiwan University Hospital /ID# 267387, Taipei City

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Linkou Chang Gung Memorial Hospital /ID# 267390, Taoyuan

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Semmelweis Egyetem /ID# 266750, Budapest

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Instituto CAICI S.R.L /ID# 251448, Rosario

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Royal Children's Hospital /ID# 251663, Parkville

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Monash Health - Monash Medical Centre /ID# 251691, Clayton

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Centro de Investigaciones Medicas Tucuman /ID# 251781, San Miguel de Tucumán

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Hospital de Niños de la Santisima Trinidad /ID# 252736, Córdoba

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Landeskrankenhaus Bregenz /ID# 266317, Bregenz

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New York Medical College /ID# 253437, Valhalla

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IRCCS Istituto Giannina Gaslini /ID# 251776, Genoa

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Hamburger Zentrum fuer Kinder- und Jugendrheumatologie /ID# 251564, Hamburg

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Levine Children's Hospital /ID# 253491, Charlotte

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Istanbul University Istanbul Medical Faculty /ID# 251652, Istanbul

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Istanbul Universitesi-Cerrahpasa Cerrahpasa Tip Fakultesi /ID# 251651, Istanbul

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Umraniye Training and Res Hosp /ID# 251653, Istanbul

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CREA de Guadalajara SC /ID# 252917, Guadalajara

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Cincinnati Childrens Hospital Medical Center /ID# 251827, Cincinnati

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Hospital Universitario y Politecnico La Fe /ID# 251352, Valencia

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St. Josef-Stift Sendenhorst /ID# 268680, Sendenhorst

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Azienda Ospedaliero Universitaria Meyer /ID# 251775, Florence

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Asklepios Klinik Sankt Augustin /ID# 251565, Sankt Augustin

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Universitaetsklinikum Freiburg /ID# 253288, Freiburg im Breisgau

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Children's Hospital of Fudan University /ID# 251619, Shanghai

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Children'S Hospital Of Soochow University /ID# 251755, Suzhou

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The Children's Hospital of Zhejiang University School of Medicine /ID# 251754, Hangzhou

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The Childrens Hospital of Chongqing Medical University /ID# 251539, Chongqing

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Xi'an Children's Hospital /ID# 251693, Xi'an

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Phoenix Children's Hospital /ID# 253403, Phoenix

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Randall Children's Hospital /ID# 251829, Portland

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CMiP - Centro Mineiro de Pesquisa Ltda - ME /ID# 251769, Juiz de Fora

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Hospital Sao Paulo /ID# 251765, São Paulo

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Hospital das Clinicas da Faculdade de Medicina da Universidade de Sao /ID# 251764, São Paulo

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Hyogo Prefectural Kobe Children's Hospital /ID# 251649, Kobe

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St Marianna University School Of Medicine /ID# 251623, Kawasaki-shi

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Niigata University Medical & Dental Hospital /ID# 251538, Niigata

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Osaka Medical and Pharmaceutical University Hospital /ID# 252092, Takatsuki-shi

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Institute of Science Tokyo Hospital /ID# 251505, Bunkyo-ku

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Universitair Medisch Centrum Utrecht /ID# 267435, Utrecht

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Hospital Sant Joan de Deu /ID# 251353, Esplugues de Llobregat

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Queen Silvia Children's Hosp /ID# 251318, Gothenburg

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Gazi University Medical Faculty /ID# 253677, Ankara

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Great Ormond Street Children's Hospital /ID# 251512, London