The bio-sonographic index. A novel modality for early detection of acute kidney injury after complex vascular surgery. A protocol for an exploratory prospective study. oleh Ahmed Zaky, Adam W Beck, Sejong Bae, Adam Sturdivant, Amandiy Liwo, Novak Zdenek, Nicole McAnally, Shama Ahmad, Brad Meers, Michelle Robbin, J F Pittet, Ashita Tolwani, Dan Berkowitz