1 Department of Health Sciences, University of Florence, Florence, Italy.
2 Hematology and Oncology Unit, Meyer Children's Hospital Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Florence, Italy.
3 Department of Medical Sciences, University of Turin, Turin, Italy.
4 Nephrology and Dialysis Unit, Meyer Children's Hospital IRCCS, Florence, Italy.
5 Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.
6 Department of Medical Oncology, All India Institute of Medical Sciences, New Delhi, India.
7 Department of Pathology, All India Institute of Medical Sciences, New Delhi, India.
8 Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY.
9 Department of Hemato-Oncology, Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands.
10 Department of Pediatrics, Mersin University Faculty of Medicine, Mersin, Turkey.
11 Department of Dermatology, No. 1 Hospital of China Medical University, Shenyang, China.
12 Department of Pediatric Hematology-Oncology, Istanbul University Cerrahpasa, Cerrahpasa Faculty of Medicine, Istanbul, Turkey.
13 Department of Neurosurgery, Meyer Children's Hospital IRCCS, Florence, Italy.
14 NEUROFARBA Department, University of Florence, Florence, Italy.
15 Department of Oncology, Azienda Ospedaliera di Rilievo Nazionale Santobono-Pausilipon, Pausilipon Hospital, Naples, Italy.
16 Department of Pediatric Hematology/Oncology, Cellular and Gene Therapy, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
17 Pathology Unit, Meyer Children's Hospital IRCCS, Florence, Italy.
18 Department of Biomedical, Experimental and Clinical Sciences "Mario Serio," University of Florence, Florence, Italy.
19 Cincinnati Children's Hospital Medical Center, University of Cincinnati School of Medicine, Cincinnati, OH.
20 Pediatric Oncology and Hematology, Armand-Trousseau Hospital, Assistance Publique-Hôpitaux de Paris, EA4340-BECCOH, Referral Center for Histiocytoses Université de Versailles Saint-Quentin-en-Yvelines, Paris, France.
21 Department of Neurology, Memorial Sloan Kettering Cancer Center, New York, NY.
22 EA4340 BECCOH, Université de Versailles Saint-Quentin-en-Yvelines, Service de Pathologie, Hôpital Ambroise Paré, Assistance Publique-Hôpitaux de Paris, Boulogne, France.
23 Department of Internal Medicine, Institut E3M French Reference Centre for Histiocytosis, Pitié-Salpȇtrière Hospital, Assistance Publique-Hôpitaux de Paris, Sorbonne Université, Paris, France.