TY  - RPRT
TI  - A practical approach to a multi-level analysis with a sparse binary outcome within a large surgical trial.
AU  - Jayne Fountain
AU  - James Gallagher
AU  - Julia Brown
PY  - 2004
DO  - 10.1111/j.1365-2753.2003.00462.x
UR  - https://pubmed.ncbi.nlm.nih.gov/15189398/
ID  - 15189398
ER  -