Table 5.

Review methodology (if explicitly stated) of the reviews

Review methodology stated (n = 20)
Guideline or handbook	Year	Quotes
Higgins JPT, Green S (editors) [23]	2011	1 (5 %)
Stroup DF et al. [24]	2000	1 (5 %)
Institute of Medicine [25]	2011	1 (5 %)
Published methodological approaches
McCullough LB et al. [9]	2007	9 (45 %)
Garrard J [26]	1999	2 (10 %)
Aveyard H [27]	2012	1 (5 %)
Jesson J et al. [28]	2011	1 (5 %)
Centre for Reviews and Dissemination [29]	2008	1 (5 %)
Hofmann B [30]	2005	1 (5 %)
Strech D et al. [17]	2012	1 (5 %)
Whittemore R et al. [31]	2005	1 (5 %)