Safety and cost-effectiveness of a simplified method for lumbar puncture in patients with hematologic malignancies. - Flores-Jimenez JA; Gutierrez-Aguirre CH; Cantu-Rodriguez OG; Jaime-Perez JC; Gonzalez-Llano O; Sanchez-Cardenas M; Sosa-Cortez AC; Gomez-Almaguer D (Acta haematologica, 2015)