TY - JOUR T1 - Occupational and Environmental Medicine and the London Faculty of Occupational Medicine JF - Occupational and Environmental Medicine JO - Occup Environ Med SP - 433 LP - 434 DO - 10.1136/oem.51.7.433 VL - 51 IS - 7 AU - Anne Cockcroft Y1 - 1994/07/01 UR - http://oem.bmj.com/content/51/7/433.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -