PT - JOURNAL ARTICLE AU - R M Howie TI - Respiratory protective equipment AID - 10.1136/oem.2002.004424 DP - 2005 Jun 01 TA - Occupational and Environmental Medicine PG - 423--428 VI - 62 IP - 6 4099 - http://oem.bmj.com/content/62/6/423.short 4100 - http://oem.bmj.com/content/62/6/423.full SO - Occup Environ Med2005 Jun 01; 62