Key points are not available for this paper at this time.
Kenneth H. Pollock, Scott R. Winterstein, Christine M. Bunck, Paul D. Curtis, Survival Analysis in Telemetry Studies: The Staggered Entry Design, The Journal of Wildlife Management, Vol. 53, No. 1 (Jan., 1989), pp. 7-15
Pollock et al. (Sun,) studied this question.