Evaluation of Risk Factors for Antibiotic Resistance in Patients with Nosocomial Infections Caused by Pseudomonas aeruginosa oleh Meliha Cagla Sonmezer, Gunay Ertem, Fatma Sebnem Erdinc, Esra Kaya Kilic, Necla Tulek, Ali Adiloglu, Cigdem Hatipoglu