Study	Selection Ascertainment of exposure	Outcome Assessment of outcome
	Secure record (e.g., surgical records)	Independent blind assessment, record linkage
Blum et al. [32]	*	*
Bodenstedt et al. [19]	*	*
Bodenstedt et al. [20]	*	*
Cheng et al. [13]	*	*
Derathé et al. [16]	*	*
Dergachyova et al. [21]	*	*
Guedon et al. [31]	*	*
	*	*
Hashimoto et al. [14]	*	*
Huaulmé et al. [18]	*	*
Jalal et al. [56]	*	*
Jin et al. [22]	*	*
Katic et al. [37]	*	*
Khan et al. [11]	*	*
Kitugachi et al. [12]	*	*
Kitugachi et al. [29]	*	*
Pangal et al. [55]	*	*
Lalys et al. [39]	*	*
Lalys et al. [40]	*	*
Lecuyer et al. [23]	*	*
	*	*
Malpani et al. [30]	*	*
Mascagani et al. [38]	*	*
Mascagani et al. [41]	*	*
Meuwssen et al. [28]	*	*
Nespolo et al. [17]	*	*
Guerin et al. [56]	*	*
Quellec et al. [33]	*	*
Ramesh et al. [24]	*	*
Shi et al. [25]	*	*
	*	*
Twinanda et al. [26]	*	*
	*	*
Twinanda et al. [27]	*	*
	*	*
Yeh et al. [15]	*	*
Yu et al. [42]	*	*
Zhang et al. [35]	*	*
Zhang et al. [34]	*	*