Table 1 Newcastle–Ottawa scale (prospective study)

1.

Atiba, 2020 [28]

*

*

*

**

*

*

*

9

2.

Aygul, Turkey, 2008 [29]

*

*

*

**

*

*

*

8

3.

Cano, 2003 [30]

*

*

*

**

*

*

*

8

4.

Cojocaru, 2013 [31]

*

*

*

**

*

*

*

8

5.

Dominguez, 2010 [32]

*

*

*

*

*

*

6

6.

Elsayed, 2020 [18]

*

*

*

*

*

*

7

7.

Liu, 2017 [17]

*

*

*

*

*

*

*

*

8

8.

Liu, 2018 [11]

*

*

*

**

*

*

*

9

9.

Lorente, Spain, 2015 [33]

*

*

*

**

*

*

*

8

10.

Lorente, Spain, 2016 [34]

*

*

*

**

*

*

*

8

11.

Lorente, 2021 [35]

*

*

*

**

*

*

*

9

12.

Lorenzano, 2018 [36]

*

*

*

*

**

*

*

*

9

13.

Mizukoshi, 2005 [37]

*

*

*

*

*

5

14.

Nakajima, 2012 [12]

*

*

*

*

*

5

15.

Polidori, 2002 [38]

*

*

*

**

*

*

*

8

16.

Tsai, 2014 [39]

*

*

*

**

*

*

*

8

17.

Zimmermann, 2004 [40]

*

*

*

**

*

*

*

8