Number (%) of references for each group and database

BiosisEmbasePascalHealth and WellnessMedlineCurrent ContentsTotal
Epidemiology52 (29.2)31 (17.4)19 (10.6)4 (2.2)36 (20.2)36 (20.2)178
Clinical aspects399 (22.9)372 (21.3)192 (11)116 (6.6)321 (18.4)341 (19.5)1741
Pathogenesis509 (31.1)319 (19.5)116 (7)26 (1.5)265 (16.2)400 (24.4)1635
Pathology35 (23.8)26 (17.6)17 (11.5)2 (1.3)31 (2.1)36 (24.4)147
Health promotion20 (11.2)24 (13.4)11 (6.1)82 (46)21 (11.7)20 (1.2)178
General aspects16 (5.8)23 (22.7)8 (7.9)19 (18.8)15 (14.8)20 (19.8)101
Noise92 (14.4)126 (19.8)49 (7.7)104 (16.3)74 (11.6)190 (29.9)635
Total112392141235376310434615