Table 2. Quality assessment of included studies using the Newcastle-Ottawa Scale.

Study	Selection	Comparability	Outcome	Total
Aponte et al [11]	3/5	2/2	2/3	7/10
Guo et al [29]	5/5	2/2	2/3	9/10
Kim et al [30]	5/5	2/2	2/3	9/10
Makowsky et al [23]	4/5	2/2	2/3	8/10
Rojanasumapong et al [31]	4/5	2/2	2/3	8/10
Sjöström et al [32]	4/5	2/2	1/3	7/10
Taylor et al [33]	5/5	0/2	2/3	7/10
Rosalie van der Vaart [10]	5/5	2/2	2/3	9/10