About the Authors

Robert Clarke

Contributed equally to this work with: Robert Clarke, Derrick A. Bennett, Sarah Parish, Rory Collins, Richard Peto

Robert.Clarke@ctsu.ox.ac.uk

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

Derrick A. Bennett

Contributed equally to this work with: Robert Clarke, Derrick A. Bennett, Sarah Parish, Rory Collins, Richard Peto

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

Sarah Parish

Contributed equally to this work with: Robert Clarke, Derrick A. Bennett, Sarah Parish, Rory Collins, Richard Peto

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

Petra Verhoef

Affiliation Unilever Research and Development, Vlaardingen, The Netherlands

Mariska Dötsch-Klerk

Affiliation Unilever Research and Development, Vlaardingen, The Netherlands

Mark Lathrop

Affiliation Centre National de Genotypage, Evry, France

Peng Xu

Affiliation Centre National de Genotypage, Evry, France

Børge G. Nordestgaard

Affiliation Herlev Hospital Department of Clinical Biochemistry, University of Copenhagen, Copenhagen, Denmark

Hilma Holm

Affiliation deCODE Inc, Rejkavik, Iceland

Jemma C. Hopewell

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

Danish Saleheen

Affiliations Department of Public Health and Primary Care, University of Cambridge, United Kingdom, Center for Non-Communicable Diseases, Karachi, Pakistan

Toshihiro Tanaka

Affiliation RIKEN Centre for Genomic Medicine, Yokohama, Japan

Sonia S. Anand

Affiliation Population Health Research Institute, Hamilton, Canada

John C. Chambers

Affiliation Imperial College Faculty of Medicine, University of London, London, United Kingdom

Marcus E. Kleber

Affiliation Luric Study Non-Profit LCC, University of Freiburg, Freiburg, Germany

Willem H. Ouwehand

Affiliation Department of Haematology, University of Cambridge, United Kingdom

Yoshiji Yamada

Affiliation Mie University Life Science Research Center, Tsu, Japan

Clara Elbers

Affiliation Department of Medical Genetics, University of Utrecht, Utrecht, The Netherlands

Bas Peters

Affiliation Utrecht Institute for Pharmaceutical Sciences, University of Utrecht, Utrecht, The Netherlands

Alexandre F. R. Stewart

Affiliation Heart Institute, University of Ottawa, Ottawa, Canada

Muredach M. Reilly

Affiliation Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America

Barbara Thorand

Affiliation Helmholtz Zentrum, Institute of Epidemiology II, German Research Center for Environmental Health, Munich, Germany

Salim Yusuf

Affiliation Population Health Research Institute, Hamilton, Canada

James C. Engert

Affiliation McGill University Health Centre, Montreal, Canada

Themistocles L. Assimes

Affiliation Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America

Jaspal Kooner

Affiliation Imperial College Faculty of Medicine, University of London, London, United Kingdom

John Danesh

Affiliation Department of Public Health and Primary Care, University of Cambridge, United Kingdom

Hugh Watkins

Affiliation Department of Cardiovascular Medicine, University of Oxford, United Kingdom

Nilesh J. Samani

Affiliation Department of Cardiovascular Sciences, University of Leicester, United Kingdom

Rory Collins

Contributed equally to this work with: Robert Clarke, Derrick A. Bennett, Sarah Parish, Rory Collins, Richard Peto

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

Richard Peto

Contributed equally to this work with: Robert Clarke, Derrick A. Bennett, Sarah Parish, Rory Collins, Richard Peto

Affiliation Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), University of Oxford, Oxford, United Kingdom

for the MTHFR Studies Collaborative Group

Membership of the MTHFR Studies Collaborative Group is provided in the Acknowledgments.

Competing Interests

The Clinical Trial Service Unit has a policy of not accepting honoraria or other payments from the pharmaceutical industry, except for reimbursement of costs to participate in scientific meetings (RCl, DAB, SP, JCH, RCo, RP). PV and MDK are employees of Unilever R&D Vlaardingen, The Netherlands. Unilever makes no claims regarding B-vitamins, homocysteine, and CVD on their food products, and PV and MDK have worked on the paper due to their expertise and data from previous academic life. PV and MDK therefore do not consider this to be a competing interest but declare it for reasons of transparency. HH is an employee of deCode, a biotechnology company that produces genetic testing services. JD and RCo are on the Editorial Board of PLoS Medicine. All other authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: RCl SP RP. Performed the experiments: RCl DAB SP RP. Analyzed the data: RCl DAB SP RP. Contributed reagents/materials/analysis tools: RCl DAB SP PV MDK ML PX BGN HH JCH DS TT SSA JCC MEK WHO YY CE BP AFRS MMR BT SY JCE TLA JK JD HW NJS RCo RP. Wrote the first draft of the manuscript: RCl SP DAB RP. Contributed to the writing of the manuscript: RCl DAB SP RP. ICMJE criteria for authorship read and met: RCl DAB SP PV MDK ML PX BGN HH JCH DS TT SSA JCC MEK WHO YY CE BP AFRS MMR BT SY JCE TLA JK JD HW NJS RCo RP. Agree with manuscript results and conclusions: RCl DAB SP PV MDK ML PX BGN HH JCH DS TT SSA JCC MEK WHO YY CE BP AFRS MMR BT SY JCE TLA JK JD HW NJS RCo RP.