1. St. Michael's Hospital, Li Ka Shing Knowledge Institute, and University of Toronto, Toronto, Ontario, Canada (M.E.F.)
2. St. Antonius Hospital, Nieuwegein, the Netherlands (J.J.M.)
3. University of California, San Francisco, San Francisco, California (S.W.H., M.C.)
4. University of Toronto, Toronto, Ontario, Canada (V.A.P.)
5. Centre for Effective Practice, Toronto, Ontario, Canada (K.L.)
6. HHT Reference Center ERN, Ospedale Maggiore, ASST Crema, Crema, Italy (E.B.)
7. Centre Hospitalier de l'Université de Montréal, Hôtel-Dieu, Montreal, Quebec, Canada (E.D.)
8. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (R.S.K., J.D.)
9. St. Michael's Hospital and University of Toronto, Toronto, Ontario, Canada (A.L., R.P.)
10. Froedtert and Medical College of Wisconsin, Milwaukee, Wisconsin (D.P., P.F.)
11. The Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada (F.R.)
12. VA Portland Health Care System and Oregon Health & Science University, Portland, Oregon (M.S.C.)
13. Cure HHT, Monkton, Maryland (M.C., S.O.)
14. University of Utah Medical Center, Salt Lake City, Utah (K.J.W., J.M.)
15. Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts (H.A.)
16. Washington University School of Medicine, St. Louis, Missouri (M.C., K.K., J.F.P., A.J.W.)
17. St. Michael's Hospital and Unity Health Toronto, Toronto, Canada (D.C.)
18. HHT Europe, Rome, Italy (C.C.)
19. Grace Hospital, Winnipeg, Manitoba, Canada (E.D.)
20. HHT Canada, Spruce Grove, Alberta, Canada (C.D.)
21. Hospices Civils de Lyon, Femme-Mère-Enfant, Lyon, France (S.D.)
22. University Hospital of Marburg and Phillips University Marburg, Marburg, Germany (U.G.)
23. Augusta University, Augusta, Georgia (J.R.G.)
24. Cincinnati Children's Hospital and University of Cincinnati, Cincinnati, Ohio (A.H.)
25. Oslo University Hospital, Rikshospitalet, Oslo, Norway (K.H.)
26. Yale University School of Medicine, New Haven, Connecticut (K.H.)
27. Mayo Clinic, Rochester, Minnesota (V.N.I.)
28. Odense University Hospital, Odense, Denmark (A.D.K.)
29. Osaka City General Hospital, Osaka, Japan (M.K.)
30. Chester, New Jersey (J.M.)
31. University of California, Los Angeles, Los Angeles, California (J.M.)
32. University of Arkansas for Medical Sciences, Little Rock, Arkansas (M.E.M.)
33. Schneider Children's Medical Center of Israel and Sackler School of Medicine of Tel Aviv University, Tel Aviv, Israel (M.M.)
34. Baltimore, Maryland (S.P.)
35. Sioux Falls, South Dakota (B.P.)
36. University of Edinburgh, Edinburgh, Scotland (M.E.P.)
37. St. Antonius Hospital, Nieuwegein, and University Medical Center Utrecht, Utrecht, the Netherlands (M.C.P.)
38. Toronto Western Hospital and University of Toronto, Toronto, Ontario, Canada (I.R.)
39. University of Colorado Hospital, Aurora, Colorado (P.J.R.)
40. Massachusetts General Hospital, Boston, Massachusetts (J.R.)
41. University of Bari, Bari, Italy (C.S.)
42. Hospital Italiano de Buenos Aires, Buenos Aires, Argentina (M.S.)
43. Hammersmith Hospital, London, England (C.S.)
44. Blue Bell, Pennsylvania (D.S.)
45. Royal Melbourne Hospital and University of Melbourne, Melbourne, Victoria, Australia (I.W.)
46. Hospital Sierrallana (Servicio Cántabro de Salud), Torrelavega, Spain (R.Z.)