TY  - RPRT
TI  - Maintenance of certification.
AU  - Roby C Thompson
AU  - James V Luck
PY  - 2003
DO  - 10.2106/00004623-200304000-00023
UR  - https://pubmed.ncbi.nlm.nih.gov/12672853/
ID  - 12672853
ER  -