Clinical efficacy of antimicrobial drugs for acute otitis media: metaanalysis of 5 400 children from thirty-three randomized trials. (Evidenzklasse: I a). - Rosenfeld,R.M.; Vertrees,J.E.; Carr,J.; Cipolle,R.J.; Uden,D.L.; Giebink,G.S.; Canafax,D.M. (J Pediatr, 1994)