| serotonin does not cause depression | 1.77 | 0.6 | 2808 | 35 | 63 |
| low serotonin does not cause depression | 1.79 | 0.6 | 7712 | 39 | 95 |
| serotonin not cause of depression | 0.93 | 0.8 | 8353 | 33 | 29 |
| cause of depression not serotonin deficiency | 0.86 | 0.7 | 8202 | 44 | 73 |
| how does serotonin cause depression | 0.53 | 0.9 | 2020 | 35 | 54 |
| does serotonin deficiency cause depression | 1.27 | 0.1 | 6699 | 42 | 10 |
| does low serotonin cause depression | 1.95 | 0.2 | 1251 | 35 | 100 |
| does low levels of serotonin cause depression | 0.58 | 0.2 | 2435 | 45 | 23 |
| is depression a lack of serotonin | 0.19 | 0.8 | 1534 | 33 | 44 |
| how does serotonin affect depression | 1.87 | 1 | 1037 | 36 | 20 |
| serotonin and depression connection | 1.44 | 0.9 | 7589 | 35 | 42 |
| relationship between serotonin and depression | 0.75 | 0.6 | 8328 | 45 | 84 |
| depression serotonin no link | 1.77 | 0.8 | 5076 | 28 | 92 |
| is serotonin decreased in depression | 0.04 | 1 | 3886 | 36 | 85 |
| serotonin in the brain and depression | 0.35 | 0.9 | 7602 | 37 | 55 |
| serotonin levels and depression | 1.32 | 0.1 | 5495 | 31 | 18 |
| is depression caused by low serotonin | 1.35 | 0.4 | 4424 | 37 | 86 |
