Table 2.

Detailed quality assessment of included trials

No.	Study	Quality assessment	Q1	Q2	Q3	Q4	Q5	Q6
1	SACG-Kyushu	A	Yes	No	Yes	Yes	No	Yes
2	SACG-Chubu	A	Yes	No	Yes	Yes	No	Yes
3	TGOG	A	Yes	No	Yes	Yes	No	Yes
4	KGSG	A	Yes	No	Yes	No	No	Yes
5	SIP	A+++	Yes	Yes	Yes	Yes	Yes	Yes
6	JFMTC-1	A	Yes	No	No	Yes	No	Yes
7	JFMTC-5	A++	Yes	Yes	Yes	Yes	No	Yes
8	JFMTC-11	A+++	Yes	Yes	Yes	Yes	Yes	Yes