[1] Cohen Childrens Med Ctr NY, Feinstein Inst Med Res, New Hyde Pk, NY 11040 USA
[2] Cohen Childrens Med Ctr NY, Feinstein Inst Med Res, Manhasset, NY USA
[3] Univ Toronto, Hosp Sick Children, Toronto, ON M5S 1A1, Canada
[4] Trousseau Hosp, Paris, France
[5] Great Ormond St Hosp Sick Children, London, England
[6] Inst Child Hlth, London, England
[7] Univ Wales Swansea, Swansea, W Glam, Wales
[8] Helsinki Univ Hosp, Helsinki, Finland
[9] Univ Helsinki, Childrens Hosp, Helsinki, Finland
[10] Hannover Med Sch, D-3000 Hannover, Germany
[11] Univ Washington, Fred Hutchinson Canc Res Ctr, Seattle, WA 98195 USA
[12] Osped Civile, Cyst Fibrosis Ctr, I-37126 Verona, Italy
[13] Univ Amsterdam, Acad Med Ctr, Emma Childrens Hosp, NL-1012 WX Amsterdam, Netherlands
[14] Youth Hlth Care, Meppel, Netherlands