Table 1.

Phases of sampling

Phase I	Articles were screened for eligibility and relevance on the basis of titles and abstracts. Selected articles were imported with PDFs into EndNote V.20 for full-text indexing (n=134).
Phase II	A sample of articles (n=53) was read in full, and emerging themes were identified, manually coded and synthesised into possible search terms with particular attention to our analytical interest in the materiality of healthcare environments.
Phase III	All indexed PDFs were searched using synthesised search terms, and matching articles were screened for inclusion on the basis of the full-text for quality, richness of primary data and relevance (n=96).
Phase IV	All articles included in phase III were screened for final inclusion on the basis of contribution to theory development (n=38).