RT Journal Article SR Electronic T1 Lymphocyte subsets in hypersensitivity pneumonitis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 5 OP 7 VO 5 IS 1 A1 Milburn, HJ YR 1992 UL http://erj.ersjournals.com/content/5/1/5.abstract AB