A double heterozygosity in 2 brothers with antithrombin (AT III) deficiency due to the association of an Arg 47 to His mutation with a 9 base pair (bp) deletion in exon VI - Vidaud, D; Sirieix, ME; Alhenc-Gelas, M; Chadeuf, G; Aillaud, MF; Juhan-Vague, I; Aiach, M (Thromb Haemost, 1991)