our technical bulletin on cervical cytology addresses it - it may be elsewhere as well. what is your mailing address? thanks, pam ***************************************************************** Pamela Van Hine (202) 863-2521 Assoc. Director & Head Librarian Fax: (202) 484-1595 ACOG Resource Center [log in to unmask] 409 12th St SW Washington DC 20024 Blessed Be! *****************************************************************