Domagała K, Ziółek MA, Maroszek M, Szymczak K, Janik B, Bakier A. PERIOPERATIVE RISK STRATIFICATION AND OPTIMIZATION IN ELDERLY SURGICAL PATIENTS: A REVIEW OF MODERN STRATEGIES AND BIOLOGICAL MARKERS IN THE ERA OF VALUE-BASED HEALTHCARE. IJITSS. 2026;5(1(49). doi:10.31435/ijitss.1(49).2026.5189