Is prolonged infusion of piperacillin/tazobactam and meropenem in critically ill patients associated with improved pharmacokinetic/pharmacodynamic and patient outcomes? An observation from the Defining Antibiotic Levels in Intensive care unit patients (DALI) cohort - Abdul Aziz, Mohd. Hafiz; Lipman, Jeffrey; Akova, Murat; Bassetti, Matteo; De Waele, Jan J.; Dimopoulos, George; Dulhunty, Joel M.; Kaukonen, Kirsi-Maija; Koulenti, Despoina; Martin, Claude; Montravers, Philippe; Rello, Jordi; et al. (Oxford University Press, 2015)