%0 Letter %T Presence of antiphospholipid antibodies in COVID-19: a case series study. %A Amezcua-Guerra LM %A Rojas-Velasco G %A Brianza-Padilla M %A Vázquez-Rangel A %A Márquez-Velasco R %A Baranda-Tovar F %A Springall R %A Gonzalez-Pacheco H %A Juárez-Vicuña Y %A Tavera-Alonso C %A Sanchez-Muñoz F %A Hernández-Salas M %J Ann Rheum Dis %V 80 %N 5 %D 05 2021 %M 32753426 %F 27.973 %R 10.1136/annrheumdis-2020-218100 %X