Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12936-019-2982-9/MediaObjects/12936_2019_2982_Fig2_HTML.png)
Schematic illustration of specific processes of: a collection of blood specimens and preparation of DBS on filter papers, scanning on mid-infrared spectrometer, and recording sample spectra; b data splitting, model training, cross-validation and evaluation of performance of final model (supervised machine learning process)