The case report form (CRF) is a paper or electronic questionnaire specifically used in clinical trial research, and is a record of the clinical trial data. The relevant data recorded in the clinical trial of the subject should be recorded in case report form that is strictly designed according to the requirements of the test protocol in advance. The CRF is just like a loopback system of clinical study, which delivers the solution to each part in the most appropriate way, and collects, stores and transmits the scientific data. CRF Design https://www.cd-biosciences.com/crf-design/