Point-of-Care Serum Proenkephalin as an Early Predictor of Mortality in Patients Presenting to the Emergency Department with Septic Shock oleh Christos Verras, Sofia Bezati, Vasiliki Bistola, Ioannis Ventoulis, Dionysis Matsiras, Sotirios Tsiodras, John Parissis, Effie Polyzogopoulou