Anti-beta 2 glycoprotein I IgA in the SLICC classification criteria dataset. - Elkhalifa, Marwa; Orbai, Ana-Maria; Magder, Laurence S; Petri, Michelle; Alarcón, Graciela S; Gordon, Caroline; Merrill, Joan; Fortin, Paul R; Bruce, Ian N; Isenberg, David; Wallace, Daniel; Nived, Ola; et al. (Lupus, 2021)