[1] Univ Amsterdam, Emma Childrens Hosp, Dept Pediat Hematol, Amsterdam UMC, Amsterdam, Netherlands
[2] Univ Med Ctr Utrecht, Wilhelmina Childrens Hosp, Ctr Benign Hematol Thrombosis & Hemostasis Van Cre, Utrecht, Netherlands
[3] Univ Amsterdam, Dept Epidemiol & Data Sci, Amsterdam UMC, Amsterdam, Netherlands
[4] Radboud Univ Nijmegen, Amalia Childrens Hosp, Nijmegen Med Ctr, Dept Pediat Hematol, Nijmegen, Netherlands
[5] Univ Med Ctr Groningen, Beatrix Childrens Hosp, Dept Pediat Hematol, Groningen, Netherlands
[6] Leiden Univ Med Ctr, Willem Alexander Childrens Hosp, Dept Pediat Hematol, Stem Cell Transplantat Unit, Leiden, Netherlands
[7] Mosakids Childrens Hosp, Dept Pediat Hematol, Maastricht UMC, Maastricht, Netherlands
[8] Juliana Childrens Hosp, Dept Pediat, Hagaziekenhuis, The Hague, Netherlands
[9] Erasmus MC Sophia Childrens Hosp, Univ Med Ctr Rotterdam, Dept Pediat Hematol & Oncol, Rotterdam, Netherlands
[10] Amsterdam UMC, Emma Childrens Hosp, Dept Pediat Hematol, Meibergdreef 9, NL-1105 AZ Amsterdam, Netherlands