Table 2

Quality assessment of studies included in the meta-anlayses
Study Study type Selection Comparability Outcome/Exposure
Jones et al [7] Cohort *** ***
Milligan et al. [12] Cohort **** * ***
Lim et al. [13] RCT *** ** **
Szaflarski [8] RCT *** ** ***
Taylor et al. [14] Cohort *** ** **
Murphy-Human et al. [15] Cohort *** ** ***

Zafar et al.

Zafar et al. BMC Neurology 2012 12:30   doi:10.1186/1471-2377-12-30

Open Data