| serotonin and depression connection | 0.3 | 0.2 | 4945 | 35 | 67 |
| serotonin and depression not linked | 1.37 | 1 | 9593 | 35 | 85 |
| serotonin and depression and anxiety | 0.06 | 0.8 | 4421 | 36 | 49 |
| serotonin in the brain and depression | 1.57 | 0.4 | 8120 | 37 | 93 |
| is serotonin related to depression | 1.2 | 0.6 | 7802 | 34 | 91 |
| serotonin not linked to depression | 0.74 | 0.8 | 6741 | 34 | 37 |
| does serotonin affect depression | 0.59 | 0.3 | 4143 | 32 | 64 |
| serotonin levels and depression | 1.25 | 0.6 | 139 | 31 | 70 |
| serotonin role in depression | 0.07 | 0.4 | 636 | 28 | 72 |
| serotonin function in depression | 0.26 | 0.9 | 8975 | 32 | 55 |
| serotonin does not cause depression | 0.83 | 1 | 8574 | 35 | 12 |
| depression serotonin no link | 1.85 | 0.3 | 9137 | 28 | 88 |
| do high levels of serotonin cause depression | 1.71 | 0.5 | 9521 | 44 | 21 |
| what role does serotonin play in depression | 1.79 | 0.9 | 1460 | 43 | 85 |
| serotonin theory of depression | 1.26 | 0.4 | 4259 | 30 | 70 |
