About the Authors

Anna-Maija Tolppanen

Affiliation Medical Research Council Centre for Causal Analyses in Translational Epidemiology, School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom

Adrian Sayers

Affiliation School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom

William D. Fraser

Affiliation Norwich Medical School, University of East Anglia, Norwich, United Kingdom

Glyn Lewis

Affiliation School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom

Stanley Zammit

Affiliations School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom, Medical Research Council Centre Centre for Neuropsychiatric Genetics and Genomics, Cardiff University, Cardiff, United Kingdom

Debbie A. Lawlor

d.a.lawlor@bristol.ac.uk

Affiliation Medical Research Council Centre for Causal Analyses in Translational Epidemiology, School of Social and Community Medicine, University of Bristol, Bristol, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: AMT GL SZ DAL. Analyzed the data: AMT AS. Contributed reagents/materials/analysis tools: WDF. Wrote the paper: AMT AS WDF GL SZ DAL.