@article{doi:10.2106/JBJS.F.01380,
author = {Wright, James G.},
title = {A Practical Guide to Assigning Levels of Evidence},
journal = {The Journal of Bone & Joint Surgery},
volume = {89},
number = {5},
pages = {1128-1130},
year = {2007},
doi = {10.2106/JBJS.F.01380},
URL = { + http://dx.doi.org/10.2106/JBJS.F.01380},
eprint = {}
}