k1 = mu
k2 = l_e
k3 = beta
k4 = R0
k5 = gamma
k6 = p
k7 = tau
k8 = theta
k9 = nu
k10 = eta
k11 = sigma
k12 = sigmaV
k13 = tInf
k14 = tImm
k15 = tImm_V
k16 = strain1_frac
k17 = strain2_frac
k18 = S_frac
k19 = V_frac
k20 = R_1_frac
k21 = R_2_frac
k22 = R_frac
k23 = env