frailtypack_frailtyPenal     frailtyPenal Frailty model. 
frailtypack_additivePenal    additivePenal Frailty model. 
frailtypack_nestedPenal	     nestedPenal Frailty model.
frailtypack_jointPenal       jointPenal Frailty model.
frailtypack_multivPenal      multivPenal Frailty model.
