TY  - GEN
AU  - Helminen-Pakkala,E
TI  - The periodontal index as affected by sample selection
SN  - 0001-6357
PY  - 1972///0111
KW  - Adolescent
KW  - Adult
KW  - Analysis of Variance
KW  - Evaluation Studies as Topic
KW  - Female
KW  - Humans
KW  - Male
KW  - Middle Aged
KW  - Periodontal Index
KW  - Sampling Studies
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.3109/00016357109026520
ER  -