highly significantp < 0.001
A highly significant correlation between the amount of human gDNA template with the total number of RPP30 copies was observed in intra-laboratory (R 2 = 0.996, p < 0.001), inter-laboratory (R 2 = 0.997, p < 0.001) and inter-operational (R 2 = 0.994, p < 0.001) RPP30 ddPCR assays (Supplementary Figure S5A to C ).