Please enter the date (first day) of the patient's last menstrual period (using 0 where applicable, e.g. 01 04 2007) and if necessary, change the menstrual cycle length.
	Day:		(dd)
	Month:		(mm)
	Year:		(yyyy)
	Cycle length:		21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 days