As the SFK holds no surgery dates, a proxy variable had to be identified. Thrombophylactic drugs, prescribed within a two-week time window of the surgery date (4 days before surgery-10 days after surgery), were chosen as all arthroplasty patients routinely receive thromboprophylaxis after knee/hip arthroplasty surgery to prevent thrombotic events [12 ]. The first and second choices for thromboprophylaxis after arthroplasty are low-molecular-weight heparin (LMWH) and direct-oral anticoagulants (DOACs), both were used for linkage (Table 2).
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