How Much Participant Outcome Data Is Missing from Sight: Findings from a Cohort of Trials Submitted to a German Research Ethics Committee

• Jamie J. Kirkham ,

  * E-mail: jjk@liv.ac.uk

  Affiliation MRC North West Hub for Trials Methodology Research, Department of Biostatistics, University of Liverpool, Liverpool, United Kingdom

  ⨯
• Kerry M. Dwan,

  Affiliation Cochrane Editorial Unit, London, United Kingdom

  ⨯
• Anette Blümle,

  Affiliation Cochrane Germany, Faculty of Medicine, University of Freiburg, Freiburg, Germany

  ⨯
• Erik von Elm,

  Affiliation Cochrane Switzerland, Institut Universitaire de Médecine Sociale et Préventive, Lausanne, Switzerland

  http://orcid.org/0000-0002-7412-0406

  ⨯
• Paula R. Williamson

  Affiliation MRC North West Hub for Trials Methodology Research, Department of Biostatistics, University of Liverpool, Liverpool, United Kingdom

  ⨯