@book{15299,
	author = {Breslow, N. E. and Day, N. E.},
	title = {Statistical methods in cancer research, vol. 2 : the design and analysis of cohort studies.},
	publisher = {International Agency for Research on Cancer,},
	year = {1987.},
	series = {IARC scientific publications ; no. 82.},
	address = {Lyon : }
}