| Number of epochs | Articles |
| 1–3 (12) | [78, 94–96, 107, 126, 127, 132, 134, 135, 164, 170] | 4–10 (14) | [42, 86, 102, 118–122, 142, 151, 161, 165, 168, 173] | 11–50 (20) | [37, 58, 66, 79, 80, 89, 90, 108–110, 113, 114, 124, 128, 140, 143, 146, 163, 167, 175] | 51–150 (20) | [82, 99, 103, 131, 133, 141, 147, 152–160, 162, 166, 172, 174] | 151–500 (7) | [39, 40, 98, 145, 171, 177, 179] | Not informed (39) | [26, 38, 41, 77, 81, 83–85, 87, 88, 91–93, 97, 100, 101, 104–106, 111, 112, 115–117, 123, 125, 129, 130, 136–139, 144, 148–150, 169, 176, 178] |
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