highly significantp < 0.0001
All patients provided informed consent (IRB University of Freiburg #514/18) to the study (DRKS-ID: DRKS00020522) We found a highly significant correlation of both on-site and shipped DBS samples with serum samples (n=100, Figure 1A and B; p < 0.0001) as well as within non-shipped and shipped DBS samples (n=100, Figure 1C; p < 0.0001).