For registered market research panel participants only.
ABOUT PANEL RESEARCH: Like many other companies, Google brings together market research panels to help learn more about things like technology usage, how people are consuming media, and how they use Google products. This is part of our Panel Research program.
For more information, refer back to the research panel membership page if you are a panelist. You may also read more about Panel Research at this webpage: google.com/landing/panelresearch/
See detail information: https://goo.gl/TNUzzF