Institutional Review Board approval
Approval from all ethics committees in the participating states in Germany was obtained prior to the study [Institutional Review Board approval: Submission No.: 837.533.17 (11367), Ethics Committee at the State Chambers of Physicians of Rhineland-Palatinate; B-F-2018-042, Ethics Committee at the State Chambers of Physicians of Baden-Wuerttemberg; MC 84/2018, Ethics Committee at the State Chambers of Physicians of Hesse].