| Approach | Used method | Type of relations | Used corpus |
| Rosario and Hearst [30] | Neural network | Cure, only dis., only treat, prevent, vague, side effect, no cure | MEDLINE 2001 | Abacha and Zweigenbaum [31] | Linear SVM | Cure, prevent, side effect | MEDLINE 2001 | Frunza et al. [32, 33] | NLP, BOW, biomedical concepts, and UMLS concepts | Cure, prevent, side effect | MEDLINE 2001 | Suchitra and Sudah [34] | Cooccurrence analysis, NLP, BOW, biomedical and UMLS concepts, inductive logic techniques, Bloom filter | Cure, prevent, side effect | MEDLINE 2001 | Muzaffar et al [35] | NLP, | | | Supervised learning methods: SVM and NB | Cure, prevent, side effect | MEDLINE 2001 | | Wang et al. [36] | Pattern, UMLS | Inducement, treatment | Abstracts from PubMed |
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