Prolongation of the atrioventricular conduction in fetuses exposed to maternal anti-Ro/SSA and anti-La/SSB antibodies did not predict progressive heart block. A prospective observational study on the effects of maternal antibodies on 165 fetuses - Jaeggi, E T; Silverman, E D; Laskin, C; Kingdom, J; Golding, F; Weber, R (J Am Coll Cardiol, 2011)