Table 3.

Bias risk assessment according to the cochrane collaboration

Components assessed	DUTCH PEERS [17]	HOST-ASSURE [18]	Lin2015 [15]	Mehilli 2013 [16]	RESOLUTE [19]	TWENTE [20]
1	2	2	2	2	2	2
2	2	2	1	2	2	2
3	1	1	1	1	2	1
4	2	1	1	1	2	2
5	1	1	1	1	1	1
6	1	1	1	1	1	1
Total score	9	8	7	8	10	9
Bias grade	B	B	C	B	A	B

The six components recommended by the Cochrane Collaborations to assess bias risk

1: Sequence generation

2: Allocation sequence concealment

3: Blinding of participants and personnel

4: Blinding of outcome assessment

5: Incomplete outcome data

6: Selective outcome reporting and other potential bias