If additional references are added after screening has begun, this will affect the “when2stop” algorithm. As a result, we strongly encourage users to upload all references before screening begins. In rare cases, there is a workaround available, which is not recommended if a large percentage (>10%) of references has already been screened. If the Reference Presentation Method is set to “Random,” additional references can be uploaded from the Manage References view. After uploading additional references, be sure to set the Reference Presentation Method back to “Predicted Relevance” and Save your changes.
Please note that using this workaround will affect the “when2stop” algorithm and estimated recall value. In addition, the impact will be greater if additional references are uploaded in later stages of the screening, and also depends on the number of additional references uploaded.