Safety of Ustekinumab With and Without Concomitant Corticosteroids or Immunosuppressants in Patients With Moderately to Severely Active Crohn's Disease: 608. (October 2017) - Sands, Bruce E.; Gasink, Christopher; Jacobstein, Douglas; Ott, Elyssa; Lang, Yinghua; Ramachandran, Paraneedharan; Ghosh, Subrata