For maximum effectiveness, ECP treatment should be started as soon as possible after unprotected intercourse, and within 120 hours. 2007, Felicia Stewart with James Trussell and Paul F.A. Van Look, “Emergency Contraception”, in Robert A. Hatcher, James Trussell, Anita L. Nelson, Willard Cates Jr., Felicia H. Stewart, Deborah Kowal, editors, Contraceptive Technology, 19th edition, Ardent Media, page 106:
(abbreviation, alt-of, initialism) Initialism of eosinophil cationic protein.