Why do authors derive new cardiovascular clinical prediction rules in the presence of existing rules? A mixed methods study

• Jong-Wook Ban ,

  * E-mail: jong-wook.ban@conted.ox.ac.uk

  Affiliation Evidence-Based Health Care Programme, Centre for Evidence-Based Medicine, University of Oxford, Oxford, United Kingdom

  http://orcid.org/0000-0002-6433-1250

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• Emma Wallace,

  Affiliation HRB Centre for Primary Care Research, Royal College of Surgeons in Ireland, Dublin, Ireland

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• Richard Stevens,

  Affiliation Nuffield Department of Primary Care Health Sciences, Medical Science Division, University of Oxford, Oxford, United Kingdom

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• Rafael Perera

  Affiliation Nuffield Department of Primary Care Health Sciences, Medical Science Division, University of Oxford, Oxford, United Kingdom

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