TY  - RPRT
TI  - Four-step CPR--improving skill retention.
AU  - J A Handley
AU  - A J Handley
PY  - 1998
DO  - 10.1016/s0300-9572(97)00095-6
UR  - https://pubmed.ncbi.nlm.nih.gov/9547836/
ID  - 9547836
ER  -