|
Study
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
Summary assessment
|
|---|
|
Arpornmaeklong et al. [19]
|
+
|
?
|
+
|
+
|
–
|
–
|
–
|
–
|
n/a
|
+
|
+
|
–
|
+
|
–
|
High
|
|
Boyan et al. [20]
|
+
|
+
|
+
|
+
|
–
|
–
|
–
|
–
|
n/a
|
+
|
+
|
–
|
+
|
–
|
High
|
- Key: (+) = low risk of bias, (?) = unclear risk of bias, (−) = high risk of bias
