| clinicaltrials gov registration | 1.15 | 0.9 | 6649 | 31 | 69 |
| clinicaltrials gov registration requirements | 0.15 | 0.7 | 6248 | 44 | 86 |
| clinical trials registration requirements | 1.62 | 0.5 | 1174 | 41 | 94 |
| clinicaltrials.gov registration | 1.68 | 0.2 | 7636 | 31 | 71 |
| clinicaltrials.gov requirements for posting | 1.4 | 0.3 | 1540 | 43 | 45 |
| clinicaltrials.gov registration number | 1.81 | 0.2 | 6585 | 38 | 93 |
| trial registration clinicaltrials.gov | 0.08 | 0.9 | 8785 | 37 | 35 |
| registration of clinical trials | 1.12 | 0.4 | 8603 | 31 | 28 |
| register clinical trial gov | 1.03 | 0.5 | 1966 | 27 | 96 |
| http://register.clinicaltrials.gov | 1.13 | 0.9 | 4151 | 34 | 82 |
| clinical trial for registration | 1.85 | 0.3 | 9235 | 31 | 3 |
| requirements for clinical trials | 1.79 | 0.2 | 8866 | 32 | 56 |
| clinicaltrials gov website info | 0.27 | 0.1 | 2226 | 31 | 40 |
| register.clinicaltrials.gov | 0.21 | 0.4 | 4240 | 27 | 68 |
| registered in clinicaltrials.gov | 0.75 | 0.4 | 1705 | 32 | 83 |
