@book{753,
	author = {Backett E M, Davies A M, Petro-Barvazian A.},
	title = {The risk approach in health care, with special reference to maternal and child health including family planning.},
	publisher = {World Health Organization,},
	year = {1984.},
	series = {Public health papers ; no. 76.},
	address = {Geneva : }
}