Scientific Reports 6: Article number: 25235; published online: 28 April 2016; updated: 31 May 2016

In the original version of this Article, Affiliations 1 and 2 were not listed in the correct order. The correct affiliations are listed below:

Affiliation 1

Karolinska Institutet, Department of Laboratory Medicine, Stockholm, 141 86, Sweden.

Affiliation 2

International Agency for Research on Cancer, World Health Organization, Screening Group, Lyon, 69372, France.

This error has now been corrected in the PDF and HTML versions of the Article.