Factor V G1691A and prothrombin G20210A in childhood spontaneous venous thrombosis – evidence of an age-dependent thrombotic onset in carriers of factor V G1691A and prothrombin G20210A mutation - Schobess, R; Junker, R; Auberger, K; Münchow, N; Burdach, S; Nowak Göttl, U (Eur J Pediatr, 1999)