string: …classified using a process that was consistent with PRISMA-P (Preferred reporting item for systematic review and meta-analysis) protocols (Moher et al. 2009) and informed by previous reviews (Clifford et al. 2013; McCalman et al. 2014; M. Heyeres, K. Tsey, I. Kinchin and J. McCalman, unpubl. data).