Placebo Comparator: Placebo
All participants will receive a standardized prednisone burst of 60 mg/day at Day 1/Baseline followed by a protocol-defined mandatory taper schedule, to Week 15.
All participants will receive placebo to match filgotinib for up to 52 weeks.
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Drug: Prednisone
Tablet(s) administered orally once daily
Drug: Placebo to match filgotinib
Tablet(s) administered orally once daily
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