Core Outcome Set-STAndards for Reporting: The COS-STAR Statement - Kirkham, J. J.; Gorst, S.; Altman, D. G.; Blazeby, J. M.; Clarke, M.; Devane, D.; Gargon, E.; Moher, D.; Schmitt, J.; Tugwell, P.; Tunis, S.; Williamson, P. R. (PLoS Medicine, 2016)