1. Department of Genetics; Harvard Medical School; Boston MA USA
2. Department of Medicine and the Howard Hughes Medical Institute; Brigham and Women's Hospital; Boston MA USA
3. Wellcome Trust Centre for Human Genetics; University of Oxford; Oxford UK
4. Research Center for Gastroenterology and Liver Diseases; Baqiyatallah University of Medical Sciences; Tehran Iran
5. Toronto General Hospital; University of Toronto; Toronto Canada
6. Pediatric Department, Bouali Hospital; Ardabil University of Medical Sciences; Ardabil Iran
7. CIBERER, Centro de Investigación Biomédica en Red de Enfermedades Raras; ISCIII; Madrid Spain
8. Clinical Genetics Unit, INGEMM, IdiPAZ; Hospital Universitario La Paz, UAM; Madrid Spain
9. Centre de génétique humaine; Université de FRanche-Comté; Besançon France
10. Department of Human and Medical Genetics; Vilnius University; Vilnius Lithuania
11. Department of Clinical Genetics; Children's Hospital at Westmead; Sydney Australia
12. Department of Medical Genomics; Royal Prince Alfred Hospital, Camperdown; Sydney Australia
13. Gastroenterology Unit, Department of Child Health; Sultan Qaboos University Hospital; Muscat Oman
14. Case Medical Center; Case Western Reserve University; Cleveland OH USA
15. Department of Physiology, Faculty of Medicine; University of Kelaniya; Ragama Sri Lanka
16. Pathology Department; Takht-e Jamshid Hospital; Karaj Iran
17. Division of Nutrition and Metabolic Diseases, Department of Internal Medicine and the Center for Human Nutrition; UT Southwestern Medical Center; Dallas TX USA
18. Institute of Pathology and Genetics; Gosselies Belgium