Yu Hu, MD^1*, Renchi Yang, MD², Ting Niu³, Heng Mei^1*, Liu Xiaofan, MD^2*, Yan Li, MD^4*, Hu Zhou^5*, Ying Feng^6*, Guangxun Gao^7*, Peng Cheng, MD^8*, Ruibin Huang, MD^9*, Linhua Yang^10*, Jianda Hu¹¹, Ming Hou, MD¹², Yazhou Yao^13*, Li Liu^14*, Yi Wang, MD^15*, De-Pei Wu^16*, Xuliang Shen^17*, Jie Jin, PhD¹⁸, Jianmin Luo^19*, Zeng Yun, MD, PhD^20*, Xin Zhou^21*, Ruixiang Xiang^22*, Zhongxing Jiang^23*, Yuansong Bai^24*, Junye Xiong^25*, Runzi Li^25* and Jianjun Zou^25*

¹Department of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
²Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, China
³West China Hospital of Sichuan University, Chengdu, Sichuan, China
⁴Department of Hematology, Institute of Hematology, West China Hospital Sichuan University, Chengdu, China
⁵Affiliated Cancer Hospital of Zhengzhou University, Zhengzhou, China
⁶Department of Hematology, The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
⁷The First Affiliated Hospital of Air Force Medical University, Xi'an, China
⁸The First Affiliated Hospital of Guangxi Medical University, Nanning, China
⁹The First Affiliated Hospital of Nanchang University, Nanchang, China
¹⁰Department of Hematology, The Second Affiliated Hospital of Shanxi Medical University, Taiyuan, China
¹¹Department of Hematology, Union Hospital, Fujian Institute of Hematology, Fuzhou, China
¹²Department of Hematology, Qilu Hospital of Shandong University, Jinan, China
¹³Baoji Central Hospital, Baoji, China
¹⁴The Second Affiliated Hospital of Air Force Medical University, Xi'an, China
¹⁵Department of Hematology, Shaanxi Provincial People's Hospital, Xi'an, China
¹⁶The first affiliated hospital of Soochow University, Suzhou, China
¹⁷Heping Hospital Affiliated to Changzhi Medical College, Changzhi, China
¹⁸The First Affiliated Hospital, Zhejiang University College of Medicine, Hangzhou, China
¹⁹The Second Hospital of Hebei Medical University, Shijiazhuang, China
²⁰Department of Hematology, First Affiliated Hospital of Kunming Medical University, Hematology Research Center of Yunnan Province, Kunming, China
²¹Wuxi People's Hospital, Wuxi, China
²²The First Affiliated Hospital of Anhui Medical University, Hefei, China
²³The First Affiliated Hospital of Zhengzhou University, Henan, China
²⁴China–Japan Union Hospital of Jilin University, Changchun, China
²⁵Jiangsu Hengrui Pharmaceuticals Co., Ltd, Shanghai, China

Sara Stefani^1*, Rocel C. Saputil, MSc^2*, Michelle MH Tan, MSc^3*, Noora Buti^4*, Deena Paul^5*, Naghma Rizvi^5*, Vashti Ragoonanan, CNS^6*, Emma Thorley, MB BChir, BA^5*, Ariam Teklemichael, BSc^5*, Camelia Vladescu, MSc^7*, Amna Malik, PhD^3*, Christine Ademokun, MBBS, FRCPath^5*, Alice C J Hart, MBBS, BSc, MRCP, FRCPath^8*, Richard Szydlo, BSc, PhD^9*, George Adams, MBChB^10*, James B. Bussel, MD¹¹, A.J. Gerard Jansen¹² and Nichola Cooper, MD³

¹Imperial College Healthcare NHS Trust, London, United Kingdom
²Centre For Haematology, Department of Immunology and Inflammation, Imperial College London, Lodnon, ENG, United Kingdom
³Centre For Haematology, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom
⁴Imperial College Healthcare NHS Trust, London, GBR
⁵Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
⁶Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom
⁷Department of Haematology, Hammersmith Hospital, Imperial Health Care NHS Trust,, London, United Kingdom
⁸Imperial College Healthcare NHS Trust, Hammermsith Hospital, London, United Kingdom
⁹Centre for Haematology, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom
¹⁰Centre for Haematology, Department of Medicine, Imperial College London, London, United Kingdom
¹¹Department of Medicine, Division of Hematology and Medical Oncology, Weill Cornell Medicine, New York, NY
¹²Department of Hematology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, Zuid Holland, Netherlands

Melanie Degliuomini, MD, MS¹, Katherine Armstrong, MD, MS¹, Michael Curry^2*, Audrey Mauguen^2*, Shakeel Modak, MD, MRCP^3*, Ira Dunkel, MD^3*, Jodi Mones, MD⁴ and Michael Ortiz, MD^3*

¹Department of Pediatrics, Hackensack, Hackensack, NJ
²Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY
³Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY
⁴Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY

Alexandra Schifferli, MD^1*, Gautier Le Gavrian^2*, Nathalie Aladjidi, MD^3*, Guillaume Moulis, MD, PhD^4*, Bertrand Godeau, MD, PHD^5*, Thierry Leblanc, MD^6*, Marc Michel, MD^7*, Guy Leverger, MD^8*, Helder Fernandes, Ph.D.^9* and Thomas Kuehne, MD¹⁰

¹Oncology/Hematology, University Children's Hospital Basel, 4031 Basel, Switzerland
²University Children's Hospital Basel, Basel, Switzerland
³Unité d’Hématologie Pédiatrique, CIC 1401 INSERM CICP, CHU Bordeaux, Bordeaux, France
⁴Service de Médecine Interne, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
⁵Service de Médecine Interne, Centre de Référence des Cytopénies Auto-immunes de l'adulte, Centre Hospitalier Universitaire Henri-Mondor, Assistance Publique-Hôpitaux de Paris (AP-HP), Université Paris-Est Créteil (UPEC), Créteil, France
⁶Service d’Hématologie et Oncologie pédiatrique, Hôpital Robert Debré, AP-HP, Paris 19, France
⁷Henri-Mondor University Hospital, Assistance Publique-Hôpitaux de Paris, UPEC, Créteil, France
⁸Pediatric Hematology Oncology Immunology Department, Armand-Trousseau University Hospital, AP-HP, Paris, France
⁹Centre de Référence National des Cytopénies Auto-immunes de l'Enfant (CEREVANCE), Bordeaux, France
¹⁰Oncology/Hematology, University Children's Hospital UKBB, Basel, Switzerland

Camelia Vladescu, MSc^1*, Alice C J Hart, MBBS, BSc, MRCP, FRCPath^2*, Deena Paul^3*, Christine Ademokun, MBBS, FRCPath^3*, Ariam Teklemichael, BSc^3*, Bridget Chivers, RN, MSc^4*, Billy Hopkins^4*, Richard Syzdlo^5*, Naghma Rizvi^3*, Vashti Ragoonanan, CNS^4*, Sandra Sigudu, CNS^4*, James B. Bussel, MD^6,7, Anastastia Gontsarova, Dr^4*, Adam Waldman, PhD, FRCP, FRCR^8* and Nichola Cooper, MA, MBBS, FRCP FRCPath^9*

¹Imperial College Healthcare NHS Trust, London, United Kingdom
²Centre For Haematology, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom
³Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom
⁴Hammersmith Hospital, Imperial College Healthcare NHS Trust, London, United Kingdom
⁵Centre for Haematology, Department of Medicine, Imperial College London, London, United Kingdom
⁶Department of Medicine, Division of Hematology and Medical Oncology, Weill Cornell Medicine, New York, NY
⁷Department of Pediatrics, Weill Cornell Medicine, New York, NY
⁸Imperial College London, London, United Kingdom
⁹Center for Haematology Department of immunology and inflammation, Imperial College London, London, United Kingdom

Jennifer MacWhirter - DiRaimo^1*, Caroline Kruse^1*, Alexandra Kruse, MD^1,2* and James B. Bussel, MD³

¹Platelet Disorder Support Association, Cleveland, OH
²Tulane University School of Medicine, New Orleans, LA
³Division of Hematology/Oncology, Weill Cornell Medical College, New York, NY

Guillaume Moulis, MD, PhD^1,2*, Manuela Rueter, MSc^2*, Matthieu Mahevas, MD, PhD^3*, Jean-Francois Viallard, MD, PhD^4,5*, Thibault Comont, MD^6*, Stéphane Chèze, MD^7*, Sylvain Audia, MD, PhD^8*, Mikael Ebbo, MD, PhD^9*, Louis Terriou, MD^10*, Jean-Christophe Lega, MD, PhD^11*, Pierre-Yves Jeandel, MD^12*, Bernard Bonnotte, MD, PhD^13*, Marc Michel, MD^14*, Maryse Lapeyre-Mestre, MD, PhD^2* and Bertrand Godeau, MD, PHD^15*

¹Department of Internal medicine, Toulouse University Hospital, Toulouse, France
²Clinical Investigation Center 1436, Toulouse University Hospital, Toulouse, France
³Service de Médecine Interne, Centre national de référence des cytopénies auto-immunes de l’adulte, Centre Hospitalier Universitaire Henri-Mondor, Assistance Publique-Hôpitaux de Paris (AP-HP), Université Paris-Est Créteil (UPEC), Creteil, France
⁴Universite Victor Segalen Bordeaux, Pessac Cedex, France
⁵Haut-Leveque Hospital, Pessac, FRA
⁶Institut Universitaire Du Cancer De Toulouse Oncopole, Toulouse, France
⁷Institut d'Hématologie de Basse Normandie, Centre Hospitalier Universitaire de Caen Normandie, Caen, France
⁸CHU de Dijon, Dijon, France
⁹Service de Médecine Interne, Hôpital La Timone, CHU Marseille, Aix-Marseille Université, Marseille, France
¹⁰CHU Lille, Service de Médecine Interne et Immunologie Clinique, Lille, France
¹¹Hospices Civils De Lyon, Pierre-Bénite, FRA
¹²Internal Medicine, CHU Nice, Nice, France
¹³Faculty of Medicine - University Hospital of Dijon, Dijon, FRA
¹⁴Henri-Mondor University Hospital, Assistance Publique-Hôpitaux de Paris, UPEC, Créteil, France
¹⁵Service de Médecine Interne, Centre de Référence des Cytopénies Auto-immunes de l'adulte, Centre Hospitalier Universitaire Henri-Mondor, Assistance Publique-Hôpitaux de Paris (AP-HP), Université Paris-Est Créteil (UPEC), Créteil, France

David J. Kuter, MD, DPhil¹, Waleed Ghanima, MD², Umer Khan, MS^3*, Mengyao Li, PhD^4*, Jenny Shan, MD^5*, Ahmed Daak, MD, PhD^4* and Nichola Cooper, MD⁶

¹Hematology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA
²Østfold Hospital Foundation, Gralum, Norway
³Biostatistics, Sanofi US Services Inc., Bridgewater, NJ
⁴Sanofi, Cambridge, MA
⁵Sanofi, Gentilly, France
⁶Centre For Haematology, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom

Michelle MH Tan, MSc, BSc^1*, Amna Malik, PhD^1*, Anwar A Sayed, PhD, MBBS, MSc^1,2,3, Rocel C. Saputil, MSc^1*, Sara Zafar, MSc, BSc^4*, Yunchuan Ding, PhD^1,5*, Emma Thorley, MB BChir, BA^6*, Ariam Teklemichael, BSc^6*, Camelia Vladescu^6*, Alice C J Hart, MBBS, BSc, MRCP, FRCPath^6*, Christine Ademokun, MBBS, FRCPath^6*, Deena Paul^6*, Naghma Rizvi^6*, Vashti Ragoonanan^6* and Nichola Cooper, MD¹

¹Centre For Haematology, Department of Immunology and Inflammation, Imperial College London, London, United Kingdom
²Department of Medical Microbiology and Immunology, Taibah University, Medina, Saudi Arabia
³Department of Surgery and Cancer, Imperial College London, London, United Kingdom
⁴Department of Medicine, Kings College London, London, United Kingdom
⁵Department of Endocrinology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
⁶Imperial College Healthcare NHS Trust, Hammersmith Hospital, London, United Kingdom

Yuehong Qin^1* and Jieyu Ye^2*

¹Nanfang Hospital, Southern Medical University, Guangzhou, China
²Department of Hematology, Nanfang Hospital, Southern Medical University, Guangzhou, China

Xu Yanmei^*, Liu Xiaofan, MD^*, Yunfei Chen, MD^*, Feng Xue, MD^*, Wei Liu^*, Rongfeng Fu, MD^*, Ting Sun, MD^*, Mankai Ju, MD^*, Renchi Yang, MD and Lei Zhang, MD, PhD^*

State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Haihe Laboratory of Cell Ecosystem, Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China

Zhuo-Yu An^1*, Ye-Jun Wu^1*, Yun He, MD^2*, Xiaolu Zhu^2*, Haixia Fu^3*, Fengrong Wang, MD^4*, Xiao-Dong Mo^5*, Yuanyuan Zhang^3*, Wei Han^5*, Huan Chen^5*, Yao Chen^3*, Chenhua Yan^3*, Yu-Hong Chen^5*, Tingting Han^3*, Yingjun Chang^2*, Xiangyu Zhao, MD, PhD^6*, Lanping Xu, MD, PhD^3*, Kaiyan Liu, MD, PhD⁷, Xiaojun Huang^8* and Xiaohui Zhang^3*

¹Peking University People’s Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of HSCT, Peking University, Beijing, China
²Peking University People’s Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematology Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
³Peking University People’s Hospital & Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
⁴Peking University People’s Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
⁵Peking University People’s Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Collaborative Innovation Center of Hematology, Beijing, China
⁶PEKING UNIVERSITY People's HOSPITAL, Beijing, Beijing, CHN
⁷Peking University People’s Hospital, Peking University Institute of Hematology, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Collaborative Innovation Center of Hematology, Peking University, Beijing, China
⁸Peking University People’s Hospital, Peking University Institute of Hematology, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, National Clinical Research Center for Hematologic Disease, Beijing, China