About the Authors

Neelke C. van der Weerd

n.c.vanderweerd@amc.uva.nl

Affiliations Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands, Department of Nephrology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands

Muriel P. C. Grooteman

Affiliations Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands, Institute for Cardiovascular Research VU Medical Center (ICaR-VU), VU Medical Center, Amsterdam, The Netherlands

Michiel L. Bots

Affiliation Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, The Netherlands

Marinus A. van den Dorpel

Affiliation Department of Internal Medicine, Maasstad Hospital, Rotterdam, The Netherlands

Claire H. den Hoedt

Affiliations Department of Internal Medicine, Maasstad Hospital, Rotterdam, The Netherlands, Department of Nephrology, University Medical Center Utrecht, Utrecht, The Netherlands

Albert H. A. Mazairac

Affiliation Department of Nephrology, University Medical Center Utrecht, Utrecht, The Netherlands

Menso J. Nubé

Affiliations Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands, Institute for Cardiovascular Research VU Medical Center (ICaR-VU), VU Medical Center, Amsterdam, The Netherlands

E. Lars Penne

Affiliations Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands, Department of Nephrology, University Medical Center Utrecht, Utrecht, The Netherlands

Carlo A. Gaillard

Affiliation Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands

Jack F. M. Wetzels

Affiliation Department of Nephrology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands

Erwin T. Wiegerinck

Affiliations Department of Laboratory Medicine, Laboratory of Genetic, Endocrine and Metabolic Diseases, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands, Hepcidinanalysis.com, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands

Dorine W. Swinkels

Affiliations Department of Laboratory Medicine, Laboratory of Genetic, Endocrine and Metabolic Diseases, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands, Hepcidinanalysis.com, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands

Peter J. Blankestijn

Affiliation Department of Nephrology, University Medical Center Utrecht, Utrecht, The Netherlands

Piet M. ter Wee

Affiliations Department of Nephrology, VU Medical Center, Amsterdam, The Netherlands, Institute for Cardiovascular Research VU Medical Center (ICaR-VU), VU Medical Center, Amsterdam, The Netherlands

CONTRAST investigators

Membership of the CONTRAST investigators is provided in the Acknowledgments.

Competing Interests

DWS is a co-founder and Medical Director of the “Hepcidinanalysis.com” initiative, which aims to serve the scientific and medical community with high-quality hepcidin-25 measurements (www.hepcidinanalysis.com). The other authors have declared that no competing interests exist. Furthermore, the main study was supported by funding from several commercial sources (Fresenius Medical Care, Gambro Lundia AB (Sweden), Roche Netherlands, Baxter Netherlands and Amgen BV Netherlands). This does not alter the authors adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: NCW MPCG MLB MAD CHH AHAM MJN ELP CAG JFMW DWS PJB PMW. Performed the experiments: NCW MPCG MLB CHH AHAM MJN ELP ETW DWS. Analyzed the data: NCW MPCG MLB CAG JFMW PMW. Contributed reagents/materials/analysis tools: NCW MPCG CHH ETW DWS. Wrote the paper: NCW MPCG MLB MAD CHH MJN ELP JFMW DWS PJB PMW.