@article{doi:10.1302/0301-620X.83B3.0830397,
author = {Freedman, K. B. and Back, S. and Bernstein, J.},
title = {Sample size and statistical power of randomised, controlled trials in orthopaedics},
journal = {The Journal of Bone & Joint Surgery British Volume},
volume = {83-B},
number = {3},
pages = {397-402},
year = {2001},
doi = {10.1302/0301-620X.83B3.0830397},
url = {https://doi.org/10.1302/0301-620X.83B3.0830397}
}