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| | A clinical trial in which the participants are not assigned by chance to different treatment groups. Participants may choose which group they want to be in, or they may be assigned to the groups by the researchers. |
| Previous Definitions: | nonmelanoma skin cancer, nonmelanomatous, nonmetastatic, nonopioid, nonprescription | | Next Definitions: | nonseminoma, nonspecific immune cell, nonsteroidal anti-inflammatory drug, nonsteroidal aromatase inhibitor, nontoxic |
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