1. From the Department of Children’s Pain Therapy and Paediatric Palliative Care, Witten/Herdecke University, School of Medicine, Witten, Germany (B.Z., J.W.); German Paediatric Pain Centre, Children’s Hospital, Datteln, Germany (B.Z., J.W., H.B., G.H.); University of Applied Sciences, Osnabrück, Germany (G.H.); and Department of Pain Management, Berufsgenossenschaftliches Universitätsklinikum Bergm