1. Ophthalmology, New York Eye and Ear Infirmary of Mount Sinai, New York, NY, USA.
2. Refractive Surgery, Virginia Eye Consultants, Norfolk, Virginia, USA.
3. Wolfe Eye Clinic, Marshalltown, IA, USA.
4. The Eye Centers of Racine and Kenosha, Racine, Wisconsin.
5. Department of Ophthalmology, Penn State College of Medicine, Hershey, Pennsylvania, USA.
6. The Cape Coral Eye Center (Tyson), Cape Coral, Florida, USA.