PT  - JOURNAL ARTICLE
AU  - Petersen, M R
AU  - Deddens, J A
TI  - A revised SAS macro for maximum likelihood estimation of prevalence ratios using the COPY method
AID  - 10.1136/oem.2008.043018
DP  - 2009 Sep 01
TA  - Occupational and Environmental Medicine
PG  - 639--639
VI  - 66
IP  - 9
4099  - http://oem.bmj.com/content/66/9/639.1.short
4100  - http://oem.bmj.com/content/66/9/639.1.full
SO  - Occup Environ Med2009 Sep 01; 66