TY  - RPRT
TI  - Incidence and prevalence defined.
AU  - P T Durfee
PY  - 1978
DO  - 10.1111/j.1751-0813.1978.tb02523.x
UR  - https://pubmed.ncbi.nlm.nih.gov/718563/
ID  - 718563
ER  -