@article{doi:,
author = {Pingsmann, A. and Freedman, Kevin B. and Bernstein, Joseph},
title = {Sample Size and Statistical Power},
journal = {The Journal of Bone & Joint Surgery},
volume = {82},
number = {9},
pages = {1360-a-1360},
year = {2000},
doi = {},
URL = { + http://dx.doi.org/},
eprint = {}
}