TNNI3 and myocardial infarction: For the postmortem cTn I levels in serum, five of the included 13 studies (Pérez-Cárceles et al., 2004 [27]; Martínez Díaz et al., 2005 [28]; Batalis et al., 2010 [30]; Sun et al., 2011 [31]; and Carvajal-Zarrabal et al., 2017 [35]) compared the differences between the cardiac death and control groups, of which, four studies (Pérez-Cárceles et al., 2004 [27]; Martínez Díaz et al., 2005 [28]; Batalis et al., 2010 [30]; and Sun et al., 2011 [31]) recruited patients who died of myocardial infarction.