I also received a call from this number. I called back, and I got music???? Anyways, I also received a not-understandable voicemail full of static. >.<
Rec'ed call from that number, and spoke with lady who claimed to be from a University in Chicago doing a survey of children's health for the CDC. I answered a lot of questions, but also asked a lot. She gave her supervisors number as 1-866-900-9601. Also left the following number for more information 1-800-223-8118 which appears to be a CDC number.
i have recieved 2 calls from this number, around 7 pm two nights in a row. I just called back, and they answered "Children's Health Study" or something, i just hung up