After Week 4, there are follow-up visits every 4 weeks until Week 48. Blood work, ophthalmologic exams, and urinalysis are done at all clinic visits, except for Week 1. Participants may continue to receive study treatment beyond Week 24 for up to 48 weeks total, unless they experience a confirmed loss of virologic and immunologic response. Regardless of treatment, all patients are followed for 48 weeks.