De patienter, der var randomiseret til at få placebo i uge 0 og 4, skiftede til at få ustekinumab (enten 45 mg eller 90 mg) i uge 12 og 16 efterfulgt af indgift hver 12. uge.
Patients randomised to receive placebo at Weeks 0 and 4 crossed over to receive ustekinumab (either 45 mg or 90 mg) at Weeks 12 and 16 followed by dosing every 12 weeks.