RT Journal A1 Wright, James G. T1 A Practical Guide to Assigning Levels of Evidence JF The Journal of Bone & Joint Surgery JO The Journal of Bone & Joint Surgery YR 2007 FD May 1 VO 89 IS 5 SP 1128 OP 1130 DO 10.2106/JBJS.F.01380 UL http://dx.doi.org/10.2106/JBJS.F.01380 AB