©2021 by the American Society of HematologyISSN 1520-4391 (print) | 1520-4383 (online)
Hematology, the ASH Education Program, is published annually by the American Society of Hematology (ASH) in one volume per year.
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© 2021 by The American Society of Hematology. All rights reserved. Copyright is not claimed in any works of the United States Government. Except as expressly permitted in this statement, no part of this publication may be used (as here in after deﬁned) in any form or by any means now or hereafter known, electronic or mechanical, without permission in writing from the Publisher, The American Society of Hematology. For purposes of this notice, the term “use” includes but is not limited to reproduction, photocopying, storage in a retrieval system, translation, and transmittal. The Publisher hereby consents to the use of this publication or any part hereof for any non- commercial educational purpose within the health ﬁeld such as classroom instruction and clinical and residency training. This publication or any part thereof may be used for educational purposes at conferences, continuing education courses, and other educational activity, provided no fee or other compensation is charged, therefore. All materials so used must acknowledge the Publisher’s copyright therein as “©2021 by The American Society of Hematology.” When requesting the Publisher’s permission to use this publication or any part thereof, please contact the Copyright Clearance Center at 222 Rosewood Drive, Danvers, MA 01923, USA; phone: 978-750-8400; fax: 978-750-4470; or The American Society of Hematology Publishing at 2021 L Street, NW, Suite 900, Washington, DC 20036, USA; phone: 202-776-0544; fax: 202-776-0545.
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Cover: Computer illustration of eosinophilia showing a view inside a blood vessel with numerous eosinophils. Source: Kateryna Kon/Science Photo Library.
This activity is supported by educational grants from AstraZeneca; Jazz Pharmaceuticals, Inc.; and Novartis Pharmaceuticals.