Determining the feasibility of calculating pancreatic cancer risk scores for people with new-onset diabetes in primary care (DEFEND PRIME): study protocol by Claridge, H, Price, CA, Ali, R, Cooke, EA, de Lusignan, S, Harvey-Sullivan, A, Hodges, C, Khalaf, N, O'Callaghan, D, Stunt, A, Thomas, SA, Thomson, J, Lemanska, A