1. Department of Ophthalmology, McGill University, Montreal, Quebec, Canada
2. Ophthalmic Consultants of Long Island, Rockville Centre, New York, USA
3. Carolina Eyecare Physicians, Mt Pleasant, South Carolina, USA
4. S.V. Malayan Ophthalmology Center, Yerevan, Armenia
5. Altos Eye Physicians, Los Altos, California, USA
6. Minnesota Eye Consultants, Minneapolis, Minnesota, USA
7. Department of Ophthalmology, University of Toronto, Toronto, Ontario, Canada
8. Department of Ophthalmology, Wills Eye Hospital, Jefferson Medical College, Philadelphia, Pennsylvania, USA