Table 3.

NOS scale for cohort studies

Author/Year	Selection	Comparability	Outcomes	NOS score
[26] C Praet/2017	4	0	2	6
[35] C Buttigliero/2016	4	1	2	7
[27] O Caffo/2014	4	0	2	6
[36] H Matsuyama/2014	4	0	2	6
[37] N Kamiya/2014	4	0	2	6
[29] Y Qu/2012	4	1	2	7
[30] M Ito/2011	4	0	2	6
[33] R Wyatt/2004	4	1	2	7

NOS, Newcastle-Ottawa Quality Assessment Form for Cohort Studies.