. 2013 Dec 7;106(1):djt337. doi: 10.1093/jnci/djt337
© The Author 2013. Published by Oxford University Press.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
Figure 1.
CONSORT diagram. DCO = data cutoff.