Development and external validation of a clinical prediction model to aid coeliac disease diagnosis in primary care: An observational study oleh Martha M.C. Elwenspoek, PhD, Rachel O'Donnell, MSc, Joni Jackson, MSc, Hazel Everitt, PhD, Peter Gillett, MBChB, Alastair D. Hay, FRCGP, Hayley E. Jones, PhD, Gerry Robins, MD, Jessica C. Watson, PhD, Sue Mallett, DPhil, Penny Whiting, PhD