RT Journal Article SR Electronic T1 Association of occupational and environmental clinics exposure code system and criteria for substances that cause work-related asthma JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 287 OP 288 DO 10.1136/oemed-2021-108174 VO 79 IS 4 A1 Kirkland, Katherine H A1 Rosenman, Kenneth D YR 2022 UL http://oem.bmj.com/content/79/4/287.abstract AB