Patient flow diagram. Patient flow diagram for the NOH-APS study on pregnancy and the 2 groups of women with recurrent abortions or 1 fetal death: women with persistent antiphospholipid antibodies (APS women), and women with negative antiphospholipid antibodies and a negative thrombophilia screening (aPLAb negative women). HBV, hepatitis B virus; HCV, hepatitis C virus.