We see that the filtering using SVM classification improves the precision for both the time point pairs (T 1 and T 2 ) significantly, boosting it from the range of 0.23-0.32 to 0.74-0.86. Note that, as per our calculations, indeed the recall of <cite>Mitra et al. [19]</cite> would be 100% (as we are taking random samples for annotation from the set of reported 'birth' cases by <cite>Mitra et al. [19]</cite> only).