Research funding: None declared.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: Authors state no conflict of interest.
Informed consent: Informed consent was obtained from all individuals included in this study.
Ethical approval: The study utilized non-assisted volumetric absorptive microsampling (VAMS), in which consenting (Ghent University Hospital Ethics Committee approval n° 2018/1514) volunteers performed a fingerprick at home.
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The online version of this article offers supplementary material (https://doi.org/10.1515/cclm-2020-1180).
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