1. Wills Eye Hospital, Mid Atlantic Retina, Thomas Jefferson University, Philadelphia, PA, USA
2. VitreoRetinal Surgery, Minneapolis, MN, USA
3. Associated Retinal Consultants, Oakland University William Beaumont School of Medicine, Royal Oak, MI, USA
4. The Retina Center, Minneapolis, MN, USA
5. The Retina Institute, St. Louis, MO, USA
6. Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, USA