. 2002 Nov 12;3(1):9. doi: 10.1186/1468-6708-3-9
Copyright © 2002 Lear et al; licensee BioMed Central Ltd. This is an Open Access article: verbatim copying and redistribution of this article are permitted in all media for any purpose, provided this notice is preserved along with the article's original URL.
Figure 1.
Diagrammatic outline of the study.