1. Department of Ophthalmology, Penn State College of Medicine, Hershey, PA, USA
2. Pennsylvania Retina Specialists, Camp Hill, PA, USA
3. Department of Public Health Sciences, Penn State College of Medicine, Hershey, PA, USA
4. Department of Ophthalmology, Oakland University William Beaumont School of Medicine, and Associated Retinal Consultants, PC, Royal Oak, MI, USA