Oldie but goodie: To scoop or not to scoop, for suspected spine injured Pt

This discussion is as old as the hills and to tell you the truth I could probably go to the mat defending either side of the argument against all comers, but what I am looking for is not a series of anecdotes, but for someone to point me in the direction of some hard research, preferably peer reviewed (and preferably not sales literature from Ferno). I did find a June 2006 JEMS article written by AJ Heightman, but it only had one reference. Thanks in advance for your help. David Courter