I cannot create a summary of this article because its content and details are not available to me. The search results provided do not contain the text of the article "Hematopoietic Stem-Cell Gene Therapy for Cystinosis" from the New England Journal of Medicine, only links to other medical publications. In order to create an accurate and factual summary according to your requirements, I need to have access to the full text of the article. Without it, I would not be able to comply with your condition to write only verified facts from the article without speculation.