1. Texas Children's Hospital and the Department of Pediatrics; Baylor College of Medicine; Houston TX
2. Bambino Gesu Children's Hospital and Tor Vergata Roma University; Rome Italy
3. Sanjay Gandhi Postgraduate Institute of Medical Sciences; Lucknow India
4. Hospital for Sick Children and the Department of Paediatrics; University of Toronto; Toronto Canada
5. Hépatologie Pédiatrique and Centre de Référence National de l'Atrésie des Voies Biliaires, Radiologie Pédiatrique, Université Paris-Sud 11, Hôpital Bicêtre, AP-HP; Le Kremlin-Bicêtre France
6. Birmingham Children's Hospital; Birmingham United Kingdom
7. Lurie Children's Hospital; Chicago IL
8. Children's Hospital of Pittsburgh of UPMC; Pittsburgh PA
9. Hospital Clinic-IDIBAPS and CIBEREHD; Barcelona Spain
10. Yale University School of Medicine; New Haven CT
11. Institute of Liver and Biliary Sciences; New Delhi India
12. University of Milan; Milan Italy