Silicosis prevalence and exposure-response relations in South African goldminers
G J Churchyard, R Ehrlich, J M teWaterNaude, L Pemba, K Dekker, M Vermeijs, N White, J Myers
Occupational and Environmental Medicine Oct 2004, 61 (10) 811-816; DOI: 10.1136/oem.2003.010967