Count | |
| 1 | |
| 22 | |
| 1 | |
| 1 | |
| 2 | |
| 3 | |
| 5 | |
| 1 | |
| 21 | |
| 6 | |
| 5 | |
| 1 | |
| 45 | |
| 3 | |
| 4 | |
| 36 | |
| 33 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 4 | |
| 1 | |
| 1 | |
| 58 | |
| 2 | |
| 1 | |
| 1 | |
| 2 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 2 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 1 | |
| 3 | |
| 1 | |
| 2 | |
| 1 | |
Urea/*analogs & derivatives/*chemical synthesis/chemistry/pharmacology | 3 |
Urea/*analogs & derivatives/*chemical synthesis/pharmacology/toxicity | 1 |