We have received at least 12 calls from NORC U Chicago, even after we have repeatedly asked them to stop calling.  They ask for personal medical information about the members of our household, which we are not going to give to strangers over the phone, though they assure us it would be anonymous(never mind that they have our address and phone number).  When we don't answer they leave messages on our answering machine asking someone to call them back to finish the survey.