Early diagnosis of coeliac disease in the Preventive Youth Health Care Centres in the Netherlands: study protocol of a case finding study (GLUTENSCREEN) oleh Johanna Escher, Nan van Geloven, Martine Charlotte de Vries, Caroline Meijer-Boekel, M.Elske van den Akker, Leti van Bodegom, Floris van Overveld, Edmond H H.M Rings, Lucy Smit, M. Luisa Mearin