TY  - RPRT
TI  - Two-level proportional hazards models.
AU  - Jerry J Maples
AU  - Susan A Murphy
AU  - William G Axinn
PY  - 2002
DO  - 10.1111/j.0006-341x.2002.00754.x
UR  - https://pubmed.ncbi.nlm.nih.gov/12495129/
ID  - 12495129
ER  -