RT Journal Article SR Electronic T1 Occupational asthma due to porcine pancreatic amylase. JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 434 OP 434 DO 10.1136/oem.55.6.434 VO 55 IS 6 A1 P G Blain A1 E Loughney YR 1998 UL http://oem.bmj.com/content/55/6/434.abstract AB