Table 2 Quality assessment according to adapted REMARK criteria.

Study	C1	C2	C3	C4	C5	C6	C7	Total
Bozzetti¹⁰	+/−	+	+	+	+	+	+	6.5
Chariyalertsak²⁴	+/−	+	−	+	+	−	+	4.5
Cho⁹	+	+	+	+	+	+/−	+	6.5
Fassan¹⁸	+	+	+	+	+	+	+	7
Fusco¹²	+	+	−	+	+	+	+/−	5.5
Geng²⁵	+/−	+	+	+	+	+	+	6.5
Gumusay¹⁷	+	+	+/−	+	+	+	+	6.5
Hedner¹⁹	+	+	+	+	+	+	+	7
Ieni¹⁶	+	+	+	+	+	+	+	7
Kim⁴⁰	+	+	+	+	+	+	+	7
Kim⁶	+	+	−	+	+	+	+	6
Kochi¹³	+/−	+	−	+	+	+	+	5.5
Konig²⁶	+	+	+	+	+	+	+	7
Marx²⁷	+	+	−	+	+	+	+	6
Ougolkov²⁸	+	+	+	+	+	+	+	7
Pagni¹¹	+/−	−	+	+	+	+	+	5.5
Park²¹	+	+	+	+	+	+	+	7
Qiu²⁹	+/−	+	+	+	+	+	+	6.5
Reichelt³⁰	+	+	+	+	+	+	+	7
Saito³¹	+/−	+	−	+	+	+	+	5.5
Schoppmann²²	+	+	+	+	+	+	+	6.5
Schoppman²³	+	+	+	+	+	+	+	7
Selcukbirick³⁴	+	+	+	+	+	+	+	7
Shibata¹⁵	+/−	+	+	+	+	+	+	6.5
Tsapralis⁸	+	−	+/−	+	+	+	+	5.5
Walch³²	+	+	+	+	+	+	+	7
Wei⁵	+/−	+	+	+	+	+	+	6.5
Wei¹⁶	+	+	+	+	+	+	+	7
Wong¹⁴	+/−	+	−	+	+	+	+	5.5
Yu³³	+	+	−	+	+	+	+	6

Studies are appointed one point for each item, half a point is allocated in case of ambiguity. Maximum score of 7 points.

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