Fig. 1

The samples with good QC scores (≤0.04) were collected more recently than those with poor QC scores (> 0.04) (P < 0.0005, Mann–Whitney U test). A QC score threshold of 0.04 is recommended by Qiagen
The samples with good QC scores (≤0.04) were collected more recently than those with poor QC scores (> 0.04) (P < 0.0005, Mann–Whitney U test). A QC score threshold of 0.04 is recommended by Qiagen