Non-Invasive Measurement of Serum Haemoglobin for the Detection of Postpartum Anaemia: A Prospective Observational Study. - Honnef, Gabriel; Hallmann, Barbara; Eichlseder, Michael; Eichinger, Michael; Zoidl, Philipp; Kollmann, Martina; Zajic, Paul; Schreiber, Nikolaus; Rief, Martin; Bornemann-Cimenti, Helmar (Journal of Clinical Medicine, 2026)