TY  - RPRT
TI  - Have you mastered PPS?
AU  - Josephine Sienkiewicz
AU  - Mary Curry Narayan
PY  - 2002
DO  - 10.1097/00004045-200205000-00009
UR  - https://pubmed.ncbi.nlm.nih.gov/12045698/
ID  - 12045698
ER  -