I tried calling back. it answers "National Opinion Research Center"

They claim to be from the University of Chicago Department of Health and Economics, and that they are conducting a survey. If you tell them you are not interested they will continue to call you anyway.

Received two calls from this number in three days. I did tell the caller that I would not like to be called again, but obviously they don't care about that and keep calling. I would like report this number if I receive another call from it.  BTW, I never told anyone else my number except my wife.

They called my number and left a message saying they were with the Center of Disease Control and are conducting a survey in my area.  I didn't call them back and won't.

OP RESEARCH :: A suspicious "technical survey" from some college. Don't even bother to answer this fake!