TY  - BOOK
AU  - Walters, Stephen J.
TI  - What is a Cox model?
T2  - What is series
PY  - 2009///
CY  - London
PB  - Hayward Medical Communications
N1  - E-books; 8 pp
UR  - http://www.bandolier.org.uk/painres/download/whatis/COX_MODEL.pdf
ER  -