IBD Center, Department of Gastroenterology, Humanitas Clinical and Research Centre, Milan, Italy; Universidade Federal de São Paulo, São Paulo, Brazil. IBD Center, Department of Gastroenterology, Humanitas Clinical and Research Centre, Milan, Italy. Department of Pneumology, Nancy University Hospital, Lorraine University, Nancy, France. Department of Gastroenterology and Inserm U954, Nancy University Hospital, Lorraine University, Nancy, France. IBD Center, Department of Gastroenterology, Humanitas Clinical and Research Centre, Milan, Italy; Department of Biomedical Sciences, Humanitas University, Milan, Italy. Electronic address: sdanese@hotmail.com.