Table I.

Jadad scale applied on clinical trials that passed PRISMA selection.

Question	Eccles et al. 2010 [18]	Fazekas et al. 2012 [16]	Ludwig et al. 2013 [19]	Eccles et al. 2015 [20]
Was the study described as randomized?	+1p	+1p	+1p	+1p
Was the method of randomization appropriate?	+1p	+1p	+1p	0p
Was the study described as blinding?	+1p	+1p	+1p	+1p
Was the method of blinding appropriate?	+1p	+1p	+1p	0p
Was there a description of withdrawals and dropouts?	+1p	+1p	+1p	+1p
Total points	5p	5p	5p	3p