Skylar Grey's fan site has the following statement:
The official version of Dr. Dre‘s new Detox single “I Need A Doctor” (feat. Skylar Grey & Eminem) has just leaked onto the internet. It’s obviously a more refined and properly mastered version of the track, and you can stream it below. The official single is set to be released on February 1st.
Source - http://www.theendlesswaltz.com/2011/01/26/skylar-grey-xxix-i-need-a-doctor-2011-leakvideo-shoot/