About the Authors

Andrea Burri

andrea.burri@kcl.ac.uk

Affiliations Biological and Experimental Psychology Group, School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom, Department of Twin Research and Genetic Epidemiology, King’s College London, London, United Kingdom

Pirro Hysi

Affiliation Department of Twin Research and Genetic Epidemiology, King’s College London, London, United Kingdom

Alex Clop

Affiliation Department of Medical and Molecular Genetics, School of Medicine, King's College London, London, United Kingdom

Qazi Rahman

Affiliation Biological and Experimental Psychology Group, School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom

Tim D. Spector

Affiliation Department of Twin Research and Genetic Epidemiology, King’s College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AB PH TS AC. Performed the experiments: AB PH. Analyzed the data: AB PH. Wrote the paper: AB QR.