TY  - RPRT
TI  - Single-level analysis of intervention studies with hierarchically structured data: a cautionary note.
AU  - R L Brown
AU  - L J Baumann
AU  - L Cameron
DO  - 10.1097/00006199-199611000-00012
UR  - https://pubmed.ncbi.nlm.nih.gov/8941310/
ID  - 8941310
ER  -