The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Statement: Guidelines for Reporting Observational Studies

• Erik von Elm ,

  *To whom correspondence should be addressed. E-mail: strobe@ispm.unibe.ch

  Affiliation Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland

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• Douglas G Altman,

  Affiliation Centre for Statistics in Medicine, University of Oxford, Oxford, United Kingdom

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• Matthias Egger,

  Affiliations Institute of Social and Preventive Medicine (ISPM), University of Bern, Bern, Switzerland , Department of Social Medicine, University of Bristol, Bristol, United Kingdom

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• Stuart J Pocock,

  Affiliation London School of Hygiene and Tropical Medicine, University of London, London, United Kingdom

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• Peter C Gøtzsche,

  Affiliation Nordic Cochrane Centre, Copenhagen, Denmark

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• Jan P Vandenbroucke,

  Affiliation Department of Clinical Epidemiology, Leiden University Hospital, Leiden, The Netherlands

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• for the STROBE Initiative