PedsQL gastrointestinal symptoms scales and gastrointestinal worry scales in pediatric patients with inflammatory bowel disease in comparison with healthy controls

James W. Varni, James P. Franciosi, Robert J. Shulman, Shehzad Saeed, Samuel Nurko, Deborah A. Neigut, Cristiane B. Bendo, Ashish S. Patel, Mariella M. Self, Miguel Saps, George M. Zacur, Jolanda Denham, Chelsea Vaughan Dark, John F. Pohl