Table 3.

Results of the Methodological Quality Assessment of Prospective and Retrospective Cohort Studies Included in Our Analyses.^a

Study (year)	Selection (maximum 4 stars)	Comparability (maximum 2 stars)	Outcome (maximum 3 stars)	Total Newcastle-Ottawa score
Eckert et al23	4	1	2	7
Nagel et al24	4	1	2	7
Junghans et al22	3	2	2	7
Li et al25	3	2	2	7
Lin et al26	3	1	2	6
Wu et al28	3	1	2	6
Zhao et al27	3	2	3	7
Neuberger et al2	4	1	2	7
Zhang et al32	3	1	2	6
Kellert et al8	3	1	2	6
Quan et al29	3	1	2	6
Sun et al30	3	2	2	7
Yu et al31	3	2	2	7

^a The Newcastle-Ottawa score was used. Most included studies carried out a 3-month follow-up. Zhao et al carried out a 1-year follow-up.