TY  - RPRT
TI  - Cusum: a statistical method to evaluate competence in practical procedures.
AU  - E J Hammond
AU  - A K McIndoe
PY  - 1996
DO  - 10.1093/bja/77.4.562
UR  - https://pubmed.ncbi.nlm.nih.gov/8942355/
ID  - 8942355
ER  -