Positive tissue transglutaminase antibodies with negative endomysial antibodies: Unresolved issues in diagnosing celiac disease

María Infantino, Mario Merone, Mariangela Manfredi, Valentina Grossi, Alessandra Landini, Maria Grazia Alessio, Giulia Previtali, M. Trevisan, Brunetta Porcelli, Martina Fabris, Donatella Macchia, Danilo Villalta, Luigi Cinquanta, Federico D’Antoni, Giulio Iannello, Paolo Soda, Nicola Bizzaro