Kudos for listing the identifier. I googled that, which brought me to http://researchsupport.admin.ox.ac.uk/governance/ethics/committees/oxtrec , and under "Approved studies 2016", I found the entry

593-16 Elizabeth Pisani What makes data sharing work? WWARN case study Minimal Risk N/A 16/5/16

which is way more transparent than most ethics statements in published papers.

Also kudos to the Central University Research Ethics Committee (CUREC) for the decision highlighted under the "Approved studies 2016" headline:

It was agreed by CUREC in early 2016 that, in the interest of transparency, OxTREC should make publicly available a list of studies that it has approved. The list below sets out those studies that have been approved by OxTREC since January 2016.