Eur J Gastroenterol Hepatol 2017 Nov;29(11):1276-1283
aDepartment of Health Services Research, Medical Faculty, Division of Epidemiology and Biometry, Carl von Ossietzky University, Oldenburg bDepartment of Clinical Epidemiology, Leibniz Institute for Prevention Research and Epidemiology - BIPS GmbH cFaculty of Human and Health Sciences, Institute for Public Health and Nursing Research IPP dChildrens Hospital, Klinikum Links der Weser, Bremen eInstitute for Health Economics and Healthcare Management, Helmholtz Zentrum München, Neuherberg fDr. von Hauner Children's Hospital, Ludwig Maximilian University, Munich gChildren's Hospital, Medical Faculty Carl Gustav Carus, Technical University Dresden, Dresden, Germany.