Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood Purification Center China‑Japan Friendship Hospital Beijing China;
Blood purification center; COVID-19; infection prevention and control; management; three-level screening;