In an average 28-day menstrual cycle, ovulation typically occurs about 14 days before the start of the next menstrual period. But in most women, ovulation occurs in the four days before or after the midpoint of the menstrual cycle.
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1 Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.  PubMed is a searchable database of medical literature and lists journal articles that discuss Cri du chat syndrome.