@misc{indiciaed00a04eaaaed,
  title = {Sample size matters: a guide for surgeons.},
  author = {Ulrich Guller and Daniel Oertli},
  year = {2005},
  doi = {10.1007/s00268-005-7921-y},
  url = {https://pubmed.ncbi.nlm.nih.gov/15834629/},
  note = {Source identifier: 15834629}
}