Familial risk of venous thromboembolism in first-, second- and third-degree relatives: a nationwide family study in Sweden.
Venous thromboembolism (VTE) clusters in families, but the familial risk of VTE has only been determined in first-degree relatives. This nationwide study aimed to determine the familial risk of VTE in first-, second- and third-degree relatives of affected individuals. The Swedish Multi-Generation Register was linked to Hospital Discharge Register data for the period 1987-2009. This was a case-coho