RT Journal Article SR Electronic T1 Occupational COPD and emphysema: two case histories JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 42 OP 43 DO 10.3399/bjgp19X700625 VO 69 IS 678 A1 Gareth Iestyn Walters A1 P Sherwood Burge A1 Simon E Trotter A1 Prabavathi Naidoo A1 Richard D Thompson A1 Alastair S Robertson YR 2019 UL http://bjgp.org/content/69/678/42.abstract AB