Table 1.

Literature review summary of used corpora

Reference	Training Corpus	Testing Corpus
[8]	275 Manual and mixed	358 Mixed
[10]	148 Manual and mixed	75 Mixed
[13]	50 Manual and mixed	156 Mixed
[12]	800 Manual and mixed	200 Mixed
[11, 14, 30, 31]	1000 Manual and mixed	200 Mixed
[9]	1575 to 2280 Automatic and only structured abstracts	318 Mixed
[5–7]	2394 to 14,279 Automatic and only structured abstracts	2394 to 14,279 Only structured