Cervical ribs in black mineworkers.
D000328:Adult; D001741:Black or African American; D044383:Black People; D002573:Cervical Rib Syndrome / Q000453:epidemiology; D002574:Cervical Vertebrae / Q000002:abnormalities*; D006801:Humans; D008297:Male; D008906:Mining; D013019:South Africa