1. Newcastle University; Newcastle upon Tyne; UK
2. Great Ormond Street Hospital for Children; NHS Foundation Trust; London UK
3. St. Anna Children's Hospital; Vienna; Austria
4. Semmelweis University; Budapest; Hungary
5. Istituto G. Gaslini; Genova; Italy
6. Skåne University Hospital; Lund University; Lund Sweden
7. Emma's Children Hospital/AMC; Amsterdam; the Netherlands
8. University of Bern; Bern; Switzerland
9. University of Lucerne; Lucerne; Switzerland
10. Great North Children's Hospital; Newcastle upon Tyne; UK