BJOG: An International Journal of Obstetrics & GynaecologyVolume 87, Issue 7 p. 640-640 CORRESPONDENCE A. F. L. Van Der Spek, A. F. L. Van Der Spek The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this authorJ. N. Martin Jr, J. N. Martin Jr The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this authorA. M. de Rosayro, A. M. de Rosayro The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this author A. F. L. Van Der Spek, A. F. L. Van Der Spek The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this authorJ. N. Martin Jr, J. N. Martin Jr The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this authorA. M. de Rosayro, A. M. de Rosayro The Departments of Anesthesiology and Obstetrics, The University of Michigan Hospital, An Arbor, Michigan, ZIP 48109, U.S.A.Search for more papers by this author First published: July 1980 https://doi.org/10.1111/j.1471-0528.1980.tb05024.xAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume87, Issue7July 1980Pages 640-640 RelatedInformation