Online hemodiafiltration without calcium replacement using citrate as an anticoagulant and dialysis fluid with 3.5 mEq of post dilutional calcium in patients with heparin-induced thrombocytopenia: Report of 2 cases Lucas Ramos; Rosario Luxardo; María Soledad Crucelegui; Nadia Satera; Yuliana Jordán Ordoñez; Guillermo Rosa-Diez;