TY  - RPRT
TI  - Sample size matters: a guide for surgeons.
AU  - Ulrich Guller
AU  - Daniel Oertli
PY  - 2005
DO  - 10.1007/s00268-005-7921-y
UR  - https://pubmed.ncbi.nlm.nih.gov/15834629/
ID  - 15834629
ER  -