Table 2.

Specimen preprocessing procedure and long-term storage conditions

Sample type	Preprocess standard method	Storage condition
Blood	Two tubes (5 mL/tube) of blood per person were collected, which had been centrifuged by 3500 rpm in 15 min, and divided into 8 EP tubes (2 tubes of albuginea and 6 tubes of plasma).	−80°C ultra-low temperature refrigerator.
Urine	On the day of collection, the urine was divided into 2 eppendorf（EP） tubes (2 and 15 mL each) at room temperature.	−80°C ultra-low temperature refrigerator.
Stool	Take a small amount, place in the preservation solution and mix well.	−80°C ultra-low temperature refrigerator.
Saliva	Centrifuge, 2500 rpm, 1 min, the supernatant and residue were placed in two 5 mL pointed EP tubes.	−80°C ultra-low temperature refrigerator.
Hair	Put 10–20 hairs (10 cm/piece) in a sealed bag.	Store at room temperature.

All EP tubes are suitable for ultra-low temperature storage.

EP, eppendorf.