ft,a	Fertility of age a in time t, a = 0..100
mt,a	Mortality of age a in time t, a = 0..100
i_sa	Incidence of CI-relevant hearing loss in age a, a = 0..100
w_ua	Willingness of unilateral implant in age a, a = 0..100
fe_ua	Feasibility of unilateral implant in age a, a = 0..100
w_ba	Willingness of bilateral implant in age a, a = 0..100
fe_ba	Feasibility of bilateral implant in age a, a = 0..100
fet	Feasibility in year t
wt	Willingness in year t
lt	Lifespan in year t
s	Simulation time
l_s	Average length of life of speech processor
l_i	Average length of life of implant