Additional File 1.

Readers can retrieve a copy of the Stata software commands, available in PDF format in the file named "Analysis_Commands.pdf", that replicate our analysis.

Format: PDF Size: 83KB Download file

This file can be viewed with: Adobe Acrobat Reader

Feudtner et al. BMC Medicine 2003 1:3   doi:10.1186/1741-7015-1-3