Rory McCulloch, FRCPath, MRCP, MBBS^1*, Tom Bull, MBBS, FRCPath, MRCP^2*, Phillip LR Nicolson, MA, MBBChir, MRCP^3*, Rebecca J Shaw, MRCP^4*, Zara Sayar, MD, FRCPath, MRCP^5*, Alexander Langridge^6*, Michala Pettitt, PhD^7*, Rita Perry^8*, David Tucker, MD^9*, Marie Scully, MD¹⁰ and HaemSTAR Collaborators. (# joint first authors)^11*

¹Department of Haematology, University Hospitals Plymouth NHS Trust, Plymouth, United Kingdom
²Haematology Department, Cambridge University Hospitals, Cambridge, ENG, United Kingdom
³Institute for Cardiovascular Sciences, University of Birmingham, Birmingham, ENG, United Kingdom
⁴Royal Liverpool University Hospital, Liverpool, United Kingdom
⁵Haematology, Whittington Health NHS Trust, London, United Kingdom
⁶Haematology, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, United Kingdom
⁷Birmingham Centre for Observational and Prospective Studies, Birmingham Surgical Trials Consortium, Birmingham, United Kingdom
⁸Institute of Applied Health Research, Birmingham Centre for Observational and Prospective Studies, Birmingham, United Kingdom
⁹Department of Haematology, Royal Cornwall Hospital, Truro, United Kingdom
¹⁰Department of Haematology, University College London Hospital, London, United Kingdom
¹¹Haematology Specialty Trainees in Audit and Research (HaemSTAR) Network, Birmingham, United Kingdom

Wei Tian, PhD^* and Brian Jamieson, MD, BA

Dova Pharmaceuticals, Durham, NC

Nora V. Butta, PhD^1*, María Teresa Alvarez Román, MD, PhD^1*, Elena Monzón Manzano^2*, Paula Acuña^3*, Mónica Martín^3*, María Isabel Rivas Pollmar^3*, Raul Justo Sanz^3*, Elena G Arias-Salgado, PhD^4*, Sara García Barcenilla^4*, Tamara Cebanu^4*, Elena González Zorrilla^4*, Miguel A Canales, MD, PhD^1,5 and Victor Jimenez-Yuste, Medical Degree. PhD^4,5*

¹Hematology and Hemotherapy Unit, La Paz University Hospital-IdiPAZ, Madrid, Spain
²Hospital Universitario La Paz-IdiPaz, Madrid, Spain
³Hospital Universitario La Paz-Idipaz, Madrid, Spain
⁴Hospital Universitario La Paz-IdiPAZ, Madrid, Spain
⁵Universidad Autónoma de Madrid, Madrid, Spain

Guillaume Moulis^1*, Manuela Rueter, MSc^2*, Margaux Lafaurie, PharmD, PhD student^3* and Maryse Lapeyre-Mestre, MD, PhD^2*

¹Service de médecine interne, Toulouse University Hospital, Toulouse, France
²Toulouse University Hospital, Toulouse, France
³UMR 1027 - Inserm - University of Toulouse, Toulouse, France

Etienne Crickx^1*, Guillaume Moulis^2*, Marc Ruivard^3*, Bouchra Asli^4*, Jean Pierre Marolleau⁵, Mikael Ebbo^6*, Etienne Riviere^7*, Sylvain Audia^8*, Louis Terriou^9*, Marc Michel^1*, Bertrand Godeau^1* and Matthieu Mahevas^10*

¹Service de Médecine Interne, Centre national de référence des cytopénies auto-immunes de l’adulte, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, Assistance Publique Hôpitaux de Paris, Université Paris Est Créteil, 94000 Créteil, Créteil, France
²Service de médecine interne, Toulouse University Hospital, Toulouse, France
³Service de médecine interne, CHU Estaing, Clermont-Ferrand, France
⁴Service de Médecine interne, C.H. Saint- Joseph et Saint-Luc, Lyon, France
⁵Hopital SUD, Amiens, Cedex 1, France
⁶Marseille Hospital, Marseille, France
⁷Service de médecine interne, Hôpital Haut-Lévêque, Bordeaux, France, Pessac, FRA
⁸CHU de Dijon, Dijon, France
⁹Hôpital Claude Huriez, Lille, France
¹⁰Service de Médecine Interne, Centre national de référence des cytopénies auto-immunes de l’adulte, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, Assistance Publique Hôpitaux de Paris, Université Paris Est Créteil, 94000 Créteil, Creteil, France

Stephanie Guillet^1*, Valentine Loustau^2*, Anissa Zarour^3*, Emmanuelle Boutin, MD^4*, Thibault Comont^5*, Nathalie Costedoat-Chalumeau, MD, PhD^6*, Brigitte Pan-Petesch, MD^7*, Delphine Gobert, M.D^8*, Stephane Cheze, MD^9*, Odile Souchaud-Debouverie^10*, Jean-Francois Viallard^11*, Anne-Sophie Morin^12*, Gaetan Sauvetre^13*, Manuel Cliquennois, MD, MSc^14*, Bruno Royer, MD^15*, Corinne Haioun, MD PhD¹⁶, Agathe Masseau^17*, Louis Terriou^18*, Claire Fieschi, MD, PhD^19*, Matthieu Mahevas^20*, Marc Michel^21* and Bertrand Godeau^21*

¹Department of Internal Medecine, Henri Mondor University Hospital, Creteil, FRA
²Department of Internal Medecine, Henri Mondor University Hospital, Creteil, France
³Henri Mondor University Hospital, Creteil, France
⁴Department of Public Health and Biostatistics, Henri Mondor Hospital, Créteil, France
⁵Service de médecine interne, IUCT Oncopole, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
⁶Department of Internal Medecine, Cochin University Hospital, Paris, FRA
⁷Haemophilia Treatment Centre, CHRU Brest, Brest, France
⁸Internal Medicine, Saint Antoine Hospital, Paris, France
⁹Service d'Hématologie Clinique, CHU Côte de Nacre, Caen, France
¹⁰Department of Internal Medecine, Miletrie University Hospital, Poitiers, France
¹¹Haut-Leveque Hospital, Pessac, FRA
¹²Department of Internal Medicine, Bondy Hospital, Bondy, FRA
¹³Department of Internal Medecine, Charles-Nicolle University Hospital, Rouen, France
¹⁴Hôpital Saint Vincent De Paul, Lille Cedex, FRA
¹⁵Department of Immuno hematology, Hôpital Saint-Louis, Assistance Publique – Hôpitaux de Paris, Paris, France
¹⁶Clinical Hematology, Henri Mondor University Hospital, UPEC, Creteil, France
¹⁷Department of Internal Medecine, Hotel Dieu Hospital, Nantes, France
¹⁸Hôpital Claude Huriez, Lille, France
¹⁹Service d’Immunologie clinique, Hôpital Saint-Louis, AP-HP, Paris, France
²⁰Service de Médecine Interne, Centre national de référence des cytopénies auto-immunes de l’adulte, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, Assistance Publique Hôpitaux de Paris, Université Paris Est Créteil, 94000 Créteil, Creteil, France
²¹Service de Médecine Interne, Centre national de référence des cytopénies auto-immunes de l’adulte, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, Assistance Publique Hôpitaux de Paris, Université Paris Est Créteil, 94000 Créteil, Créteil, France

Jia-Ning Zhang^1*, Peng Zhao^2*, Kaiyan Liu³, Ming Hou^4*, Yanqiu Han, PhD^5*, Jian-Da Hu, PhD⁶, Ze-Ping Zhou^7*, Xin Wang, MD, PhD⁸, Ru Feng^9*, Lin-Hua Yang, MD^10*, He-Bing Zhou^11*, Tie-nan Zhu, MD^12*, Ye Jun Wu^1* and Xiao-Hui Zhang^13*

¹Peking University People's Hospital, Beijing, China
²Peking University Institute of Hematology, Peking University People's Hospital, Beijing, China
³Peking University People’s Hospital, Peking University Institute of Hematology, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Beijing, China
⁴Qilu Hospital, Shandong University, Jinan, CHN
⁵The Affiliated Hospital of Inner Mongolia Medical University, Hohhot, Nei Mongol, CHN
⁶Department of Hematology, Fujian Institute of Hematology, Fujian Provincial Key Laboratory on Hematology, Union Hospital, Fujian Institute of Hematology, Fuzhou, China
⁷The Second Affiliated Hospital of Kunming Medical University, Kunming, CHN
⁸Department of Hematology, Shandong Provincial Hospital Affiliated to Shandong University, Jinan, China
⁹Beijing Hospital, Beijing, CHN
¹⁰Department of Hematology, The Second Hospital of Shanxi Medical University, Taiyuan, China
¹¹Department of Hematology,Beijing Luhe Hospital,Capital Medical University, Beijing, China
¹²Department of Hematology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
¹³Peking University People’s Hospital, Peking University Institute of Hematology, Beijing, China, Beijing, China

Sameer Doshi^1*, Zachary Jones^1*, Ari Pritchard-Bell^1*, Joseph Park¹ and Per Olsson Gisleskog^2*

¹Amgen Inc, Thousand Oaks, CA
²POG Pharmacometrics Ltd, London, United Kingdom

Neelan Sriranjan, MD^1*, Brett L. Houston, MD², Emily Rimmer, MD, FRCPC^2,3, Chantalle Menard, MD^4*, Murdoch Leeies, MD^5*, Allan Garland, MD^5*, Ryan Zarychanski, MD, MSc, FRCPC^2,6, Steve Doucette, MSc^7* and Donald S. Houston, MD, PhD³

¹Internal Medicine, University of Manitoba, Winnipeg, MB, Canada
²University of Manitoba / CancerCare Manitoba, Winnipeg, MB, Canada
³Section of Hematology and Medical Oncology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
⁴University of Manitoba, Winnipeg, MB, CAN
⁵University of Manitoba, Winnipeg, MB, Canada
⁶Cancercare Manitoba University of Manitoba, Winnipeg, MB, Canada
⁷Dalhousie University, Halifax, NS, Canada

James B. Bussel¹, Waleed Ghanima², Nichola Cooper, MD³, Alexandra Kruse^4*, Caroline Kruse^4*, Yoshiaki Tomiyama⁵, Ming Hou⁶, Cristina Santoro^7*, Serge Laborde^8*, Mervyn Morgan^9*, Barbara Lovrencic^10*, Tom Bailey, MSci^11*, Jens Haenig^12* and Drew Provan^13*

¹Division of Hematology/Oncology, Weill Cornell Medical College, New York, NY
²Department of Medicine, Østfold Hospital Trust, Kalnes, Norway
³Hammersmith Hospital, Imperial College London, London, United Kingdom
⁴Platelet Disorder Support Association, Cleveland, OH
⁵Osaka University Hospital, Osaka, Japan
⁶Department of Hematology, Qilu Hospital of Shandong University, Jinan, China
⁷Hematology, University Hospital Policlinico Umberto I, Rome, Italy
⁸O’Cyto, Saint Loubès, France
⁹ITP Support Association, Bolnhurst, United Kingdom
¹⁰Italian Association for Immune Thrombocytopenic Purpura, Caprino Veronese, Italy
¹¹Adelphi Real World, Bollington, United Kingdom
¹²Novartis Pharma AG, Basel, Switzerland
¹³Barts and The London School of Medicine and Dentistry, London, United Kingdom

Paul J. Hampel, MD¹, David L. Murray, MD, PhD^2*, Rajiv K. Pruthi, M.B.B.S^1,3, Aishwarya Ravindran, MBBS⁴, Dong Chen, M.D., Ph.D.² and Ronald S. Go, MD^1,5

¹Division of Hematology, Mayo Clinic, Rochester, MN
²Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
³Division of Hematopathology, Special Coagulation Laboratory, Mayo Clinic, Rochester, MN
⁴Division of Hematopathology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
⁵Mayo Clinic Rochester, Division of Hematology, Onalaska, WI

Surbhi Warrior, MD MPH^1*, Elizabeth Behrens, MD¹, Sefer Gezer, MD^2,3, Parameswaran Venugopal, MD^2,3 and Shivi Jain, MD, MBBS^2,3

¹Department of Internal Medicine, Rush University Medical Center, Chicago, IL
²Division of Hematology Oncology, Rush University Medical Center, Chicago, IL
³Rush University Cancer Center, Chicago, IL

Eun-Ju Lee, MD¹, Madhav Seshadri, MD^2* and James B. Bussel³

¹Department of Medicine, NewYork-Presbyterian Weill Cornell Medical College-New York Presbyterian Hospital, New York, NY
²Weill Cornell/New York-Presbyterian Hospital, New York, NY
³Department of Pediatrics, Division of Hematology, Weill Cornell Medicine, New York, NY

Jennifer Diraimo, MS, CCGC^1*, Caroline Kruse^1*, Michele P. Lambert, MD, MSTR² and Alexandra Kruse^1,3*

¹Platelet Disorder Support Association, Cleveland, OH
²Department of Pediatrics, Division of Hematology, Children's Hosp. of Phila., Philadelphia, PA
³Tulane University School of Medicine, New Orleans, LA

Irene García García^1*, Moraima Jiménez^2*, David Valcárcel, MD, PhD³, Maria Eva Mingot-Castellano, PhD, MD^4*, Maria Cristina Pascual Izquierdo, PhD, MD^5*, Aurora Viejo, MD^6*, Miquel Lozano^7*, Rosa Goterris, MD^8*, Jorge Martínez Nieto^9*, Ana Oliva, MD^10*, Inés Gómez-Seguí, PhMD^11*, Luis Hernandez, MD^12*, Saioa Zalba^13*, Verónica Campuzano^14*, Yolanda Martínez^15*, Helena González^16*, Inmaculada Tallon^17*, Miguel Fernández Zarzoso^18*, Gemma Moreno Jiménez, MD^19*, Sunil Lakhwani Lakhwani^20*, Sandra Ortega^21*, María Solé^22*, Jon Ander Atucha Fernández^23*, Julio Del Rio-Garma, MD^24* and Joan Cid, MD, PhD^7*

¹Hematology and Hemotherapy, Hospital Universitario Ramón y Cajal, Madrid, Spain
²Department of Hematology, University Hospital Vall d'Hebron, Barcelona, Spain
³Hematology Department, Department of Hematology. Vall d’Hebron Institute of Oncology (VHIO), University Hospital Vall d’Hebron., Barcelona, Spain, Barcelona, Spain
⁴Hospital Universitario Virgen del Rocio, Sevilla, Spain
⁵Hematology, Hospital Universitario Gregorio Marañon, Madrid, Spain
⁶Transfusion Medicine, La Paz University Hospital-IdiPAZ, Madrid, Spain
⁷Hospital Clínic, Barcelona, Spain
⁸Hospital Clinico Universitario de Valencia, Valencia, Spain
⁹Hospital Clínico San Carlos, Madrid, Spain
¹⁰H Universitario V de la Candelaria, Tenerife, Spain
¹¹Servicio de Hematología. Hospital La Fe, Valencia, Spain, Valencia, Spain
¹²Hospital General Universitario de Alicante, Alicante, Spain
¹³Complejo Hospitalario de Navarra, Pamplona, Spain
¹⁴Hospital Universitario de Burgos, Burgos, Spain
¹⁵Fundación Jiménez Díaz, Madrid, Spain
¹⁶Hospital General de Villalba, Villalba, Spain
¹⁷Hospital Virgen Macarena, Sevilla, Spain
¹⁸Hospital Universitario Dr. Peser, Valencia, Spain
¹⁹Hematology and Hemotherapy Department, Hospital Universitario Ramón y Cajal, Madrid, Spain
²⁰Department of Hematology, Hospital Universitario de Canarias, La Laguna, La Laguna, Spain
²¹Hospital de Bellvitge, Banc de Sang i Teixits, L´Hospitalet de Llobregat, Spain
²²Hospital Juan R. Jiménez, Huelva, Spain
²³Hospital Universitario de Basurto Osakidetza, Basurto, Spain
²⁴Hospital Universitario Orense, ORENSE, Spain

Rawan Hammoudeh, MBBS¹, Yaser Alkhatib, MD² and Qutaiba Sabha^1*

¹Department of Internal Medicine, Henry Ford Hospital/Wayne State University, Detroit, MI
²Division of Hematology and Oncology, Henry Ford Health System, Detroit, MI

Shivi Jain, MD, MBBS¹, Matthew Wojdyla, PharmD^2*, Michael Vredenburg, PhD^2*, Brian Jamieson, MD, BA² and Terry B. Gernsheimer, MD³

¹Division of Hematology Oncology, Rush University Medical Center, Chicago, IL
²Dova Pharmaceuticals, Durham, NC
³Department of Medicine, Division of Hematology, University of Washington Medical Center, Seattle, WA

Seema S. Bhatwadekar, MD, MBBS^1,2, Shubhangi Vishwas Deshpande, M.D^3*, Shweta Vikas Khadse, BHMS^4*, Devashri Jani, BHMS^4*, Ujjwala Lakhmapurkar, BAMS^4*, Pina Vasoya, BAMS^4*, Saloni Shah, BHMS^4*, Aangi Jayesh Shah, MBBS^4*, Bijal Shah, MBBS, DCP^5* and Devenkumar Desai, MBBS DCP^6*

¹Haemato-oncology Care Centre,, Vadodara, IND
²Bhailal Amin Hospital, Vadodara, India
³GMERS Medical College and Hospital Gotri, Vadodara, India
⁴Haemato Oncology Care Centre (HOCC), Vadodara, India
⁵Labcore Speciality Laboratory, Vadodara, India
⁶Lab core Speciality Lab, Vadodara, India

Michael D Tarantino, MD¹, Michael Vredenburg, PhD^2*, Wei Tian, PhD^2*, Brian Jamieson, MD, BA² and Kashyap B Patel, MD^3*

¹Bleeding & Clotting Disorders Institute, Peoria, IL
²Dova Pharmaceuticals, Durham, NC
³Carolina Blood and Cancer Care, Rock Hill, SC