1. Panhandle Eye Group, 7400 Fleming, Amarillo 79106, TX, USA
2. Texas Tech University Health Science Center, 1400 S. Coulter, Amarillo 79106, TX, USA
3. SurgiVision Consultants, 28071 N. 90th Way, Scottsdale 85262, AZ, USA
4. Durrie Vision, 8300 College Blvd Suite 201, Overland Park 66210, KS, USA