Table 1.

Overview of the study methods and assessment of the level of evidence

	Randomized	d- blind	VAS	SF-36	Multicenter	Level
TAPP [1]	No	No	No	No	No	2b
TAPP [2]	Yes	Yes	Yes	Yes	No	1b
TAPP [3]	Yes	Yes	Yes	Yes	No	1b
TEP [4]	Yes	Single	Yes	Yes	Yes	1b
TEP [5]	Yes	Single	Yes	Yes	Yes	1b
TEP [6]	Yes	Yes	Yes	No	No	1b
Accordance	5	3	5	4	2	–

Study [1] is not comparable to the other