1 Jonas Children's Vision Care, Department of Ophthalmology, New York-Presbyterian Hospital, New York, NY, USA.
2 Jonas Children's Vision Care, Department of Ophthalmology, New York-Presbyterian Hospital, New York, NY, USA; Department of Pathology & Cell Biology, Institute of Human Nutrition, and Columbia Stem Cell Initiative, New York, NY, USA. Electronic address: sht2@cumc.columbia.edu.