About the Authors

Robert P. van Waateringe

r.p.van.waateringe@umcg.nl

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Marjonneke J. Mook-Kanamori

Affiliations Department of Biostatistics, Epidemiology and Scientific Computing, Epidemiology Section, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia, Department of Physiology and Biophysics, Weill Cornell Medical College, Doha, Qatar

Sandra N. Slagter

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Melanie M. van der Klauw

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Jana V. van Vliet-Ostaptchouk

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Reindert Graaff

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Helen L. Lutgers

Affiliation Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, The Netherlands

Karsten Suhre

Affiliations Bioinformatics Core, Weill Cornell Medical College, Doha, Qatar, Research Centre for Environmental Health, Helmholtz Zentrum Munchen, Neuherberg, Germany

Mohammed M. El-Din Selim

Affiliation Department of Dermatology, Hamad Medical Corporation, Doha, Qatar

Dennis O. Mook-Kanamori

Affiliations Department of Biostatistics, Epidemiology and Scientific Computing, Epidemiology Section, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia, Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands

Bruce H. R. Wolffenbuttel

Affiliation Department of Endocrinology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands

Competing Interests

RG is founder and shareholder of DiagnOptics BV, Groningen, the Netherlands, manufacturing autofluorescence readers (http://www.diagnoptics.com) which has been used in the present study. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceptualization: RvW MMK DOMK BHRW. Data curation: RvW MMK. Formal analysis: RvW MMK. Funding acquisition: BHRW. Investigation: RvW MMK DOMK. Methodology: RvW MMK DOMK BHRW. Project administration: RvW BHRW. Resources: MMEDS KS. Software: RvW. Supervision: BHRW DOMK. Validation: BHRW DOMK. Visualization: RvW MMK SNS MMvdK JVvVO RG HLL KS MMEDS DOMK BHRW. Writing – original draft: RvW MMK. Writing – review & editing: RvW MMK SNS MMvdK JVvVO RG HLL KS MMEDS DOMK BHRW.