Journal has three policies on data sharing:

 1: We require that the data generated by your research that supports your article be made openly and publicly available upon publication of your article. Where it is not possible or viable to make data openly available (due to confidentiality or sensitivity issues), they should be shared through a controlled access repository.

2:  We strongly encourage that data generated by your research that supports your article be made available as soon as possible, wherever legally and ethically possible. We require data from clinical trials to be made available upon reasonable request. We require that a data sharing plan must be included with trial registration for clinical trials that begin enrolling participants on or after 1st January 2019. Changes to the plan must be noted in the Data Availability Statement and updated in the registry record (to comply with ICMJE recommendations)

3: We strongly encourage that data generated by your research that supports your article be made available as soon as possible, wherever legally and ethically possible.

Data Availability Statement

All BMJ Journals require a Data Availability Statement for any submitted research articles. On submission, authors are asked to select at least one of the standardised Data Availability Statements text options below in bold as applicable and to supplement these statements with additional information as noted in the guidance below. Authors can select more than one statement if they have data under different conditions. The ICMJE recommendations provide further guidance on how to compose a rich statement.

These statements will be published under the header ‘Data Availability Statement’ within the footnotes section of the final published article.

• • Data are available in a public, open access repository
    Please state the repository name, the persistent URL, and any conditions of reuse (eg. licence, embargo). All data that are publicly available and used in the writing of an article should be cited in the text and the reference list, whether they are data generated by the author(s) or by other researchers.
  • Data are available upon reasonable request
    Please state what the data are (e.g. deidentified participant data), who the data are available from, their publishable contact details (e.g. a generic lab email address or an individual’s ORCID identifier – please ensure you have permission) and under what conditions reuse is permitted. Is there additional information available (e.g. protocols, statistical analysis plans)?
  • Data may be obtained from a third party and are not publicly available
    Please state what the data are (e.g. deidentified participant data), who the data are available from, their publishable contact details (e.g. a generic lab email address or an individual’s ORCID identifier – please ensure you have permission), and under what conditions reuse is permitted. Is there additional information available (e.g. protocols, statistical analysis plans)
  • There are no data in this work
    Please state ‘Not applicable’ in the free text box
  • All data relevant to the study are included in the article or uploaded as supplementary information
    Please ensure this does not include patient identifiable data. Please state ‘Not applicable’ in the free text box
  • No data are available
    Please state ‘Not applicable’ in the free text box