Age-range–matched external validation of standard liver volume equations: Methodological re-evaluation of 13 regression models - Hiroshi Imamura; Ryota Ito; Hirofumi Ichida; Ryuji Yoshioka; Yoshihiro Mise; Shuko Nojiri; Katsuhiro Sano; Atsuyuki Yamataka; Akio Saiura (PLoS ONE, 2026)