R M Conroy, E O'Brien, K O'Malley, N Atkins
Conroy R M, O'Brien E, O'Malley K, Atkins N.
Measurement error in the Hawksley random zero sphygmomanometer: what damage has been done and what can we learn?
British Medical Journal 1993; 306 :1319
doi:10.1136/bmj.306.6888.1319