Darby, S. C., O'Hagan, J. A., Kendall, G. M., Doll, R., Fell, T. P., & Muirhead, C. R. (1991). Completeness of follow up in a cohort study of mortality using the United Kingdom National Health Service Central Registers and records held by the Department of Social Security.

Darby, S C., J A. O'Hagan, G M. Kendall, R. Doll, T P. Fell, e C R. Muirhead. Completeness of Follow Up in a Cohort Study of Mortality Using the United Kingdom National Health Service Central Registers and Records Held By the Department of Social Security. 1991.

Darby, S C., et al. Completeness of Follow Up in a Cohort Study of Mortality Using the United Kingdom National Health Service Central Registers and Records Held By the Department of Social Security. 1991.