Table 1 Studies included in the review and major variables recorded

Cho [21]

① + ③ + ④

3

111

24

RL: Grade 0, 98 Grade 1, 13

Hua et al. [32]

① + ③ + ④

2

41

18

RL: Grade 0, 40 Grade 1, 1

Ko et al. [34]

① + ③^a + ④

3

14

29.7

RL: Grade 0, 14

Ahn et al. [22]

① + ③ + ④^b

3

31

36.1

RL: Grade 0, 25 Grade 1, 5 Grade 2, 1

Ohishi et al. [30]

① + ③

2

29

22.9

RL: Grade 0, 26 Grade 1, 1 Grade 2, 1 Grade 3, 1

Lie et al. [31]

① + ③

1

10

13

RL: Grade 0, 7 Grade 1, 3

Sansone et al. [12]

① + ③

2

30

32

RL: Grade 0, 19 Grade 1, 10 Grade 2, 1

Calvisi et al. [33]

② + ③

3

22

24

RL: Grade 0, 14 Grade 1, 5 Grade 2, 2 Grade 3, 1

Hughston et al. [27]

② + ③ + ④

1

25

71.6

Excellent: 12 Good: 8, Fair: 3, Poor: 2

Rauschning [17]

② + ③^c + ④

2

15

22.3

Grade 0, 14 Clin. Exam. (Recurrent cyst), 1

Rupp et al. [15]

③

4

16

25.2

Visual analog scale Score 1: 2 Score 2: 2 Score 4: 1 Score 9: 2 Score 10: 9