@article{doi:10.2106/JBJS.I.01555,
author = {,  and Sun, Xin and Heels-Ansdell, Diane and Walter, Stephen D. and Guyatt, Gordon and Sprague, Sheila and Bhandari, Mohit and Sanders, David and Schemitsch, Emil and Tornetta, III ,Paul and Swiontkowski, Marc},
title = {Is a Subgroup Claim Believable?A User's Guide to Subgroup Analyses in the Surgical Literature},
journal = {The Journal of Bone & Joint Surgery},
volume = {93},
number = {3},
pages = {e8 1-9},
year = {2011},
doi = {10.2106/JBJS.I.01555},
URL = { + http://dx.doi.org/10.2106/JBJS.I.01555},
eprint = {}
}