RT Journal Article SR Electronic T1 Clinical guidelines and indications for bronchoalveolar lavage (BAL): extrinsic allergic alveolitis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 945 OP 946 DO 10.1183/09031936.93.03080945 VO 3 IS 8 A1 G Semenzato A1 L Bjermer A1 U Costabel A1 PL Haslam A1 D Olivieri YR 1990 UL http://erj.ersjournals.com/content/3/8/945.abstract AB