Development and Evaluation of the Abdominal Pain Knowledge Questionnaire (A-PKQ) for Children and Their Parents oleh Verena Neß, Clarissa Humberg, Franka Lucius, Leandra Eidt, Thomas Berger, Martin Claßen, Nils Christian Syring, Jens Berrang, Christine Vietor, Stephan Buderus, Lisa-Marie Rau, Julia Wager