Long-term Safety of Lumacaftor/Ivacaftor in Subjects With Cystic Fibrosis Who Are Homozygous for F508del and 12 to <24 Months of Age at Treatment Initiation

This is a Phase 3, multicenter, open-label and roll-over study in subjects who are 12 to <24 months of age at initiation of lumacaftor ivacaftor lum iva treatment.>