TY  - RPRT
TI  - Multilevel analysis in health services research: a tutorial.
AU  - Dag Hofoss
AU  - Marijke Veenstra
AU  - Unni Krogstad
PY  - 2003
UR  - https://pubmed.ncbi.nlm.nih.gov/14587220/
ID  - 14587220
ER  -