TY  - RPRT
TI  - Defining and classifying periodontitis: need for a paradigm shift?
AU  - Vibeke Baelum
AU  - Rodrigo Lopez
PY  - 2003
DO  - 10.1034/j.1600-0722.2003.00014.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12558801/
ID  - 12558801
ER  -