From age to physiological reserve: Frailty and muscle strength in early postoperative outcomes after abdominal surgery. - Montanari E; Boccardi V; Semeraro E; Marano A; Santarelli M; Malerba S; Prete FP; Testini M; Girnyi S; Skokowski J; Schlögl M; Kristensen MT; et al. (American journal of surgery, 2026)