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This letter was referred to William Ledger, who wrote the following reply

Published online by Cambridge University Press:  02 January 2015

William J. Ledger*
Affiliation:
Given Foundation Professor of Obstetrics and Gynecology, Cornell University Medical College, Obstetrician and Gynecologist-in-Chief, The New York Hospital, 525 E. 68th St. New York, New York 10021
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Copyright
Copyright © The Society for Healthcare Epidemiology of America 1981