[1] Erasmus Univ, Med Ctr, NL-3000 DR Rotterdam, Netherlands
[2] Sophia Childrens Univ Hosp, Rotterdam, Netherlands
[3] Emma Childrens Hosp, Amsterdam, Netherlands
[4] Acad Med Ctr, Amsterdam, Netherlands
[5] Vrije Univ Amsterdam, Med Ctr, Amsterdam, Netherlands
[6] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[7] Wilhelmina Childrens Hosp, Univ Med Ctr, Utrecht, Netherlands
[8] St Jude Childrens Res Hosp, 332 N Lauderdale St, Memphis, TN 38105 USA
[9] Columbia Univ, Med Ctr, New York, NY 10027 USA
[10] Mem Sloan Kettering Canc Ctr, 1275 York Ave, New York, NY 10021 USA
[11] Univ Rochester, Med Ctr, Rochester, NY 14642 USA
[12] Univ Genoa, I-16126 Genoa, Italy
[13] Ist Giannina Gaslini, Genoa, Italy
[14] Univ Turin, Turin, Italy
[15] St Anna Hosp, Turin, Italy
[16] Univ Torino, Turin, Italy
[17] St Georges Univ Hosp NHS Fdn Trust, London, England
[18] Great Ormond St Hosp Children NHS Fdn Trust, London, England
[19] Great North Childrens Hosp, Newcastle Upon Tyne, Tyne & Wear, England
[20] Newcastle Univ, Newcastle Upon Tyne, Tyne & Wear, England
[21] Univ Hosp Birmingham NHS Fdn Trust, Queen Elizabeth Hosp Birmingham, Birmingham, W Midlands, England
[22] Royal Hosp Sick Children, Edinburgh, Midlothian, Scotland
[23] City Hope Natl Med Ctr, Duarte, CA USA
[24] Univ Alabama Birmingham, Birmingham, AL USA
[25] Univ New South Wales, Sydney, NSW, Australia
[26] Univ Munster, Univ Hosp Muenster, Munster, Germany
[27] Univ Penn, Philadelphia, PA 19104 USA
[28] Skane Univ Hosp, Lund, Sweden
[29] Lund Univ, Lund, Sweden
[30] Seattle Childrens Hosp, Seattle, WA USA
[31] Emory Univ, Atlanta, GA 30322 USA
[32] Aflac Canc Ctr Childrens Healthcare Atlanta, Atlanta, GA USA