Before revision: A case report form (or CRF) is a paper or electronic questionnaire specifically used in clinical trial URL The Case Report Form is the tool used by the sponsor of the clinical trial to collect data from each participating site .
After revision: A case report form (or CRF) is a paper or electronic questionnaire specifically used in clinical trial URL The Case Report Form is the tool used by the sponsor of the clinical trial to collect data from each participating patient .