Piperacillin/Tazobactam versus cefotaxime plus metronidazole for treatment of children with intra-abdominal infections requiring surgery - Maltezou, H C; Nikolaidis, P; Lebesii, E; Dimitriou, L; Androulakakis, E; Kafetzis, D A (Eur J Clin Microbiol Infect Dis, 2001)