Methodology
The review involved a search of the databases MEDLINE
and CINAHL, the search engine Google Scholar and hand
searching of the reference lists of retrieved papers to
recover primary research peer-reviewed literature in both
English and Japanese, published between 2000 and 2013.
Table 1 outlines the number of items initially retrieved
while Fig. 2 demonstrates the screening process according
to the PRISMA guidelines [14]. Due to the varied nature of
the methods found in the studies retrieved, a narrative
synthesis methodology [15] was considered appropriate.