@article{doi:10.2106/JBJS.L.00243,
author = {Whelan, Daniel B. and Dainty, Katie and Chahal, Jaskarndip},
title = {Efficient Designs: Factorial Randomized Trials},
journal = {The Journal of Bone & Joint Surgery},
volume = {94},
number = {Suppl 1(E)},
pages = {34-38},
year = {2012},
doi = {10.2106/JBJS.L.00243},
URL = { + http://dx.doi.org/10.2106/JBJS.L.00243},
eprint = {}
}