Sacco, Rosario, Antonietta Condoluci, Lucia Stella Curto, Vincenzo Orsini, Roberto Romano, Giuseppina Vescio, Nikolaos Filiotis, Michele Ammendola, Giarelli Guido, and Giuseppe Sammarco. “A New Frailty Index As a Risk Predictor of Morbidity and Mortality: Its Application in a Surgery Unit”. European Journal of Oncology and Environmental Health 23, no. 1 (July 31, 2018): 41–46. Accessed February 23, 2025. https://mattioli1885journals.com/index.php/EJOEH/article/view/6938.