Diagnosis and antibiotic treatment of acute otitis media: report from International Primary Care Network. (Evidenzklasse: III). - Froom,J.; Culpepper,L.; Grob,P.; Bartelds,A.; Bowers,P.; Bridges-Webb,C.; Grava-Gubins,I.; Green,L.; Lion,J.; Somaini,B. (BMJ, 1990)