EDTA plasma, heparinised plasma, serum and white cells (buffy coat) were aliquoted into a total of nineteen 0.5 mL 2D QR-coded cryovial tubes suitable for long-term cryopreservation. Each cryovial was individually logged in two un-linked databases using a single-tube QR-code reader, placed in a 96-position rack and stored locally at -20°C. PAXgene RNA tubes were stored as whole blood at -20°C.