Table 3.

Quality assessment for every included case report or case series

No.	Study	1	2	3	4	5	6
1	Acharya et al.7 (2017)	+	?	+	+	+	+
2	Akan and Mehreliyeva32 (2006)	+	?	+	?	?	+
3	Baraldi et al.33 (2010)	+	+	+	+	+	+
4	Bayar et al.9 (2012)	+	+	+	?	?	–
5	Bronstein and Osborne34 (1984)	+	+	–	+	?	+
6	Capote et al.35 (2005)	+	+	+	+	–	–
7	Choi et al.36 (2013)	+	+	?	+	?	+
8	Colquhoun et al.37 (2002)	+	–	?	?	-	-
9	Costa et al.16 (2012)	+	+	+	+	+	+
10	de la Torre et al.38 (2001)	+	?	+	?	?	–
11	Duffy39 (1980)	+	?	+	+	–	–
12	Fernández Ferro et al.30 (2008)	+	?	+	+	+	+
13	Fitzpatrick40 (1970)	+	?	+	+	+	+
14	Galiè et al.41 (2010)	+	?	+	+	+	+
15	Gerbino et al.42 (1997)	+	?	+	+	+	+
16	Ghazizadeh et al.6 (2017)	+	?	+	+	–	–
17	Giacomuzzi et al.43 (1986)	+	+	+	+	+	+
18	Gibbons et al.66 (2001)	+	?	+	?	?	?
19	Gibbons and Abulhoul31 (2007)	+	?	+	+	+	?
20	Hayter and Robertson44 (1989)	+	+	+	+	–	+
21	Huang et al.45 (2020)	+	?	–	+	–	+
22	Inoue et al.46 (2020)	+	?	+	+	?	+
23	Khadembaschi et al.25 (2020)	?	+	+	+	+	+
24	Kim et al.15 (2014)	?	+	–	+	v	+
25	Kraut47 (1985)	+	+	+	+	+	+
26	Kreutz and Sanders48 (1985)	+	?	+	+	+	+
27	Lee and Chung14 (2012)	+	+	–	+	–	+
28	Leovic et al.49 (2006)	+	+	?	?	?	?
29	Loh et al.50 (1997)	+	?	+	?	?	+
30	Lucaya et al.51 (1982)	+	?	–	?	?	?
31	Mano et al.52 (2005)	+	+	+	+	+	+
32	McLoughlin et al.8 (1995)	+	?	+	?	?	–
33	Monevska et al.53 (2016)	+	+	+	?	?	+
34	Monks54 (1978)	+	+	+	+	+	+
35	Puche et al.24 (2012)	+	+	+	+	?	+
36	Ramalho-Ferreira et al.55 (2011)	+	+	+	+	+	+
37	Romano et al.56 (2017)	?	–	+	+	–	–
38	Rowe57 (1963)	?	+	+	–	+	–
39	Satoh et al.58 (2006)	?	+	+	+	+	+
40	Schneble et al.59 (2019)	+	+	–	+	?	+
41	Shurman67 (1975)	+	+	–	–	?	?
42	Smyth and Wake10 (1994)	?	+	+	+	+	+
43	Starch-Jensen and Kjellerup3 (2017)	+	+	+	+	+	+
44	Tavassol et al.60 (2012)	+	+	–	–	?	?
45	Tieghi et al.70 (2005)	+	+	+	+	+	+
46	Totsuka and Fukuda68 (1991)	+	+	+	+	+	+
47	Tucker et al.61 (1984)	?	+	+	+	+	+
48	Turk et al.23 (1999)	+	–	–	?	–	+
49	Utsman et al.69 (2013)	+	+	?	?	?	–
50	Wallender et al.22 (2015)	+	+	+	–	+	+
51	Wenghoefer et al.62 (2008)	+	+	+	?	–	–
52	Yamaguchi et al.63 (1998)	+	+	+	+	+	+
53	Yoshida et al.64 (2008)	?	+	+	+	?	+
54	Yura et al.65 (2009)	+	+	+	+	+	+
55	Zhong et al.17 (2009)	?	+	+	+	+	+

Refer to Table 2 for the content of questions 1 to 6.