The BMJ asks authors of original research articles to state in their manuscripts whether they are making available any additional unpublished data. These may comprise raw unprocessed data as well as protocols, analyses, statistical codes, images, and ideas (http://resources.bmj.com/bmj/authors/types-of-article/research). We ask this largely because we are keen to maximise the usefulness and usage of data and promote transparency, but also because many research funders now encourage or even mandate data sharing.1 Many BMJ articles' authors simply say “no additional data available,” but a growing repository of positive data sharing statements range from “an audit trail of the forest plots and related data is available at www.wolfson.qmul.ac.uk/bptria”2 to “a full list of participants’ quotes and explanations offered by the authors to illustrate each of the four themes are available on request from the corresponding author at …