PedsQL gastrointestinal symptoms module: Feasibility, reliability, and validity

James W. Varni, Cristiane B. Bendo, Jolanda Denham, Robert J. Shulman, Mariella M. Self, Deborah A. Neigut, Samuel Nurko, Ashish S. Patel, James P. Franciosi, Miguel Saps, Barbara Verga, Alicia Smith, Alyson Yeckes, Nicole Heinz, Annette Langseder, Shehzad Saeed, George M. Zacur, John F. Pohl