Characterization of Covid-19 infected pregnant women sera using laboratory indexes, vibrational spectroscopy, and machine learning classifications - Guleken, Zozan; Jakubczyk, Paweł; Paja, Wiesław; Pancerz, Krzysztof; Bulut, Huri; Öten, Esra; Depciuch, Joanna; Tarhan, Nevzat