Table 1.

Risk of Bias according MINOR

Study	Inclusion C/S/Ba	Clear stated aim	Inclusion consecutive patients	Prospective data collection	Endpoints appropriate to aim	Unbiased assessment of endpoint	Appropriate follow-up period	Loss to follow-up <5 %	Prospective calculation of study size	Total points
Niedergethmann et al. [47]	C	1	2	0	1	0	2	2	0	8
Solorzano et al. [53]	S	1	2	0	1	0	1	2	0	7
Chu et al. [81]	S	2	2	0	2	0	1	2	0	9
Matthews et al. [29]	C	2	2	0	2	0	2	2	0	10
Sarmiento et al. [48]	B	1	2	0	1	0	2	1	0	7
Guo et al. [31]	C	1	2	0	1	0	1	1	0	6
Norton et al. [30]	C	2	2	0	2	0	1	2	0	9
Jarufe et al. [23]	B	2	2	1	2	0	1	2	0	10
Kang et al. [68]	S	2	2	0	2	0	1	2	0	9
Sledzianowski et al. [45]	C	2	2	2	2	0	2	2	0	12
Tomassetti et al. [49]	S	2	2	2	2	0	2	2	0	12
Vagefi et al. [69]	S	2	2	0	2	0	2	1	0	9
Bloomston et al. [70]	S	2	2	0	2	0	2	2	0	10
Chung et al. [32]	C	1	2	0	1	0	2	2	0	8
Kazanjian et al. [46]	B	2	2	0	2	0	2	2	0	10
Winter et al. [82]	S	1	2	0	1	0	2	2	0	8
Bahra et al. [71]	S	2	2	1	2	0	2	2	0	11
Casanova et al. [33]	C	0	2	0	0	0	2	2	0	6
Chul Chung et al. [54]	S	2	2	0	2	0	1	2	0	9
Liu et al. [34]	C	2	2	0	2	0	2	2	0	10
Nguyen et al. [72]	S	2	2	0	2	0	2	2	0	10
Schurr et al. [73]	S	2	2	0	2	0	2	2	0	10
Bettini et al. [63]	S	2	2	2	2	0	2	2	0	12
Bilimoria et al. [59]	S	2	2	2	2	0	2	2	0	12
Bonney et al. [74]	S	1	2	0	1	0	1	1	0	6
Fernández-Cruz et al. [24]	C	2	2	2	2	0	2	2	0	12
Fischer et al. [64]	S	2	2	2	2	0	1	2	0	11
Jagad et al. [35]	B	1	2	0	1	0	2	2	0	8
Ruiz-Tovar et al. [36]	B	0	2	0	0	0	2	1	0	5
Ballian et al. [50]	S	2	2	2	2	0	2	1	0	11
Goh et al. [37]	C	2	2	0	2	0	2	1	0	9
Pitt et al. [38]	B	2	2	0	2	0	1	2	0	9
Casadei et al. [65]	S	2	2	1	2	0	2	2	0	11
Falconi et al. [25]	C	2	2	2	2	0	2	2	0	12
Franko et al. [55]	S	2	2	0	2	0	1	2	0	9
Goh et al. [60]	S	2	2	0	2	0	1	2	0	9
Ito et al. [83]	S	2	2	0	2	0	2	2	0	10
Pomianowska et al. [84]	S	2	2	0	2	0	2	2	0	10
Scarpa et al. [51]	S	2	2	2	2	0	2	2	0	12
Arvold et al. [78]	S	2	2	0	2	0	1	2	0	9
Bettini et al. [75]	S	2	2	0	2	0	2	2	0	10
Fernández-Cruz et al. [27]	C	2	2	2	2	0	2	2	0	12
Hu et al. [39]	C	2	2	0	2	0	2	2	0	10
Krausch et al. [56]	S	2	1	0	2	0	1	1	0	7
Sellner et al. [76]	S	2	2	0	2	0	2	2	0	10
Wang et al. [77]	S	2	2	0	2	0	2	1	0	9
Wang et al. [61]	S	2	2	0	2	0	2	2	0	10
Boninsegna et al. [66]	S	2	2	2	2	0	2	2	0	12
Cherif et al. [28]	B	2	2	2	2	0	2	2	0	12
Crippa et al. [26]	C	2	2	1	2	0	2	2	0	11
Dahdaleh et al. [57]	S	2	2	0	2	0	2	1	0	9
Inchauste et al. [40]	C	2	2	0	2	0	2	2	0	10
Kim et al. [58]	S	2	2	0	2	0	1	1	0	8
Krampitz et al. [52]	S	2	2	2	2	0	2	2	0	12
Poultsides et al. [41]	B	2	2	0	2	0	1	1	0	8
Tsuchikawa et al. [79]	S	2	2	0	2	0	1	1	0	8
Tsutsumi et al. [62]	S	2	2	0	2	0	2	2	0	10
Zhang et al. [42]	C	2	2	0	2	0	2	1	0	9
Cherenfant et al. [80]	S	1	2	0	2	0	1	1	0	7
Haugvik et al. [43]	B	2	2	0	2	0	2	2	0	10
Martin-Perez et al. [67]	S	2	2	2	2	0	1	1	0	10
Watzka et al. [44]	B	2	2	0	2	0	0	1	1	8

^aStudy included in c complication analysis, s survival analysis or b both complication and survival analysis