1. Hamilton Glaucoma Center, Shiley Eye Institute, Viterbi Family Department of Ophthalmology, UC San Diego, La Jolla, California, United States
2. Department of Ophthalmology, University Medical Center Mainz, Germany
3. School of Medicine, Callahan Eye Hospital, University of Alabama-Birmingham, Birmingham, Alabama, United States
4. Bernard and Shirlee Brown Glaucoma Research Laboratory, Edward S. Harkness Eye Institute, Department of Ophthalmology, Columbia University Medical Center, New York, New York, United States