1. Andover Eye Associates, Andover, MA, USA
2. Alcon Laboratories, Fort Worth, TX, USA
3. Eye Care Associates of Greater Cincinnati, Inc., Mason, OH, USA
4. Charlotte Eye, Ear, Nose, and Throat Associates, Charlotte, NC, USA
5. Shasta Eye Medical Group, Inc., Redding, CA, USA
6. Silverstein Eye Centers, Kansas City, MO, USA