About the Authors

Sigrun Helga Lund

sigrunhl@hi.is

Affiliation Faculty of Physical Sciences, University of Iceland, Reykjavik, Iceland

Daniel Fannar Gudbjartsson

Affiliation deCODE Genetics, Reykjavik, Iceland

Thorunn Rafnar

Affiliation deCODE Genetics, Reykjavik, Iceland

Asgeir Sigurdsson

Affiliation deCODE Genetics, Reykjavik, Iceland

Sigurjon Axel Gudjonsson

Affiliation deCODE Genetics, Reykjavik, Iceland

Julius Gudmundsson

Affiliation deCODE Genetics, Reykjavik, Iceland

Kari Stefansson

Affiliation deCODE Genetics, Reykjavik, Iceland

Gunnar Stefansson

Affiliation Faculty of Physical Sciences, University of Iceland, Reykjavik, Iceland

Competing Interests

Daniel Fannar Gudbjartsson, Thorunn Rafnar, Asgeir Sigurdsson, Sigurjon Axel Gudjonsson, Julius Gudmundsson and Kari Stefansson are employed by a commercial company, deCODE Genetics. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: SHL GS JG TR SAG KS. Performed the experiments: AS. Analyzed the data: SHL DFG GS. Contributed reagents/materials/analysis tools: AS SAG SHL. Wrote the paper: SHL TR GS.