TY - JOUR T1 - Author's reply JF - Occupational and Environmental Medicine JO - Occup Environ Med SP - 359 LP - 359 DO - 10.1136/oem.54.5.359 VL - 54 IS - 5 AU - S M Rappaport AU - Rong Chun Yu Y1 - 1997/05/01 UR - http://oem.bmj.com/content/54/5/359.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -