Gastroenterology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;
Gastroenterology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;
Gastroenterology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;
Gastroenterology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;
Methodist Research Institute, Houston, USA;
Gastroenterology Unit, Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy;