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. 2021 Aug 18;11(8):e049228. doi: 10.1136/bmjopen-2021-049228

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Outcomes used to assess current data-sharing practices for individual patient data for clinical trials organised per outcome domain and number of studies exploring these outcomes. Study designs considered. Experimental: prospective research that implies testing the impact a strategy (eg, randomised controlled trial). Survey: a general view, exploration or description of individuals and/or research objects. Metrics: descriptive metrics from each initiative provided by the initiative. Qualitative: research that relies on non-numerical data to understand concepts, opinions or experiences. Other: any other research not covered above (eg, case studies, environmental scans). IPD, individual participant data.