. 2022 Jul 29;101(30):e29443. doi: 10.1097/MD.0000000000029443

Table 3.

The NOS scale of the included studies.

Study	Selection	Comparability	Exposure	Total
anzai2020	^**	^**	^**	6
cadby2015	^***	^**	^**	7
feng2019	^**	^**	^***	7
gali2020	^**	^**	^**	6
gami2007	^**	^*	^***	6
mehra2006	^**	^**	^***	7
neilan2013	^**	^**	^**	6
wong2015	^**	^**	^***	7
zhao2015	^**	^**	^***	7
Uchôa 2015	^***	^**	^**	7
chilukuri2009	^**	^**	^***	7
chilukuri2010	^**	^**	^***	7
jongnarangsin2008	^**	^**	^***	7
kendzerska2018	^**	^**	^***	7
selim2016	^**	^**	^**	6
Mehra2009	^**	^*	^***	6