Table 4.

Quality scores included studies evaluated on effectiveness in review.

Author (year)	Design	Size	Exposure	Outcome	Adjustment	Total
Carral (2015) [42]	2	2	0	2	0	6
Choi (2016) [20]	2	0	0	2	1	5
Evans (2015) [34]	2	2	0	1	2	7
Fujioka (2012) [32]	1	0	0	2	0	3
Herring (2016) [31]	2	2	0	2	2	8
Homko (2007) [39]	2	1	0	1	0	4
Homko (2012) [41]	2	1	0	1	0	4
Jordan (2015) [44]	2	2	0	1	2	7
Moniz (2015) [33]	1	1	0	1	0	3
Nicholson (2016) [36]	2	0	0	2	0	4
Perez-Ferre (2010) [40]	2	1	0	2	0	5
Pollak (2014) [21]	2	0	0	1	0	3
Soltani (2015) [28]	2	0	0	0	0	2
Stockwell (2014) [43]	2	2	1	2	2	9
van Dijk (2016) [35]	2	2	1	2	0	7
Yudin (2017) [45]	2	2	0	2	0	6