“…As shown in Figure 3 , the CinC11 [ 4 ] dataset was most frequently used in the studies; it originated from the PhysioNet/Computing in Cardiology Challenge 2011. Eleven studies only cross-validated their results on the same dataset that they used to train their model [ 6 , 8 , 10 , 11 , 12 , 14 , 19 , 22 , 24 , 25 , 29 ]. This likely results in a higher accuracy than cross-validating on data gathered separately from the training set.…”