RT Journal Article SR Electronic T1 Correction: Sofia intermediate catheter and the SNAKE technique: safety and efficacy of the Sofia catheter without guidewire or microcatheter construct JF Journal of NeuroInterventional Surgery JO J NeuroIntervent Surg FD BMJ Publishing Group Ltd. SP e12 OP e12 DO 10.1136/neurintsurg-2017-013256corr1 VO 13 IS 6 YR 2021 UL http://jnis.bmj.com/content/13/6/e12.abstract AB