Publishers may the right person to answer this. however you may choose to select the others that are available and look into the latest updates on many other sites that keep updating them till the new one arrives. Needless to mention it is book compilations form annals dating back almost 50 years since the first additions and many principles off medicine have not changed in there normal existence and practise.
wish it helps.
Harrison’s Principles of Internal Medicine, 20th edition Copyright © 2018 by The McGraw-Hill Companies, Inc. All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher.
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I would suggest that you contact the publisher of the book, McGraw Hill Publishers. Someone there may be able to answer your question
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