IL6 and atrial fibrillation: Seventh, we used a single proinflammatory cytokine (i.e., IL-6), rather than multiple proinflammatory cytokines, to exclude PTL patients with possible IUI, despite a recent study that has reported that PTL patients can have a network of different inflammatory-related proteins in the AF according to the presence or absence of MIAC and/or intra-amniotic inflammation.