Development and early feasibility testing of machine-learning algorithms to non-invasively assess hemoglobin levels. - Hefner, Simon; Stoffers, Philipp; Langenberger, Benedikt; Holstein, Alix; Garafolj, Miha; Klötzer, Christina; Herling, Carmen; Vucinic, Vladan; Henschler, Reinhard; Stern, Ariel Dora; Platzbecker, Uwe; Platzbecker, Anne Sophie (npj Biomedical Innovations, 2026)