Forced expiratory volume and expiratory flow rate in black miners and in a control group Author: Sluis-Cremer GK. Source: S Afr Med J. 1975; 49:1783-1786. Babalwa Jekwa2019-04-08T11:52:41+02:00Dec 31st, 1975| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail