Authors: J G Hay; P Stone; J Carter; S Church; A Eyre-Brook; M G Pearson; A A Woodcock; P M Calverley Journal: Eur Respir J Date: 1992-06 Impact factor: 16.671
Authors: N R Anthonisen; J E Connett; J P Kiley; M D Altose; W C Bailey; A S Buist; W A Conway; P L Enright; R E Kanner; P O'Hara Journal: JAMA Date: 1994-11-16 Impact factor: 56.272