| Theme/variants of PSO | Standard PSO | PSO with neural network | Improved/extended PSO | Hybridized PSO |
| Heart disease | [9, 16, 24, 25, 30, 32, 33, 37, 39, 42, 43, 57] | [14, 28] | [50, 51, 53, 54] | [46, 48] | Dental disease | [26] | — | — | — | Lymphatic disease | [8] | — | [55] | — | Celiac disease | [27] | — | — | — | Liver disease | [2, 24, 29, 34] | — | [51, 52, 55] | — | Cancer disease | [2, 24, 30–32, 34] | — | [15, 51, 53, 55, 56] | — | Brain disease | [24, 34–36, 38, 41, 44, 45] | — | [11, 13, 51, 55] | [47] | Hepatitis disease | [30, 40] | — | [51, 56] | — | Diabetes | [24, 30] | — | [49, 51, 53, 55, 56] | — | Others | — | [12] | [53] | — |
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