Low Urinary Free Cortisol as a Risk Factor for Patients with Variceal Bleeding oleh Ioanna Aggeletopoulou, Efthymios P. Tsounis, Maria Kalafateli, Maria Michailidou, Maria Tsami, Konstantinos Zisimopoulos, Martha Mandellou, Georgia Diamantopoulou, Maria Kouskoura, Marina Michalaki, Catherine K. Markopoulou, Konstantinos Thomopoulos, Christos Triantos