NEW YORK, Sept. 26, 2019 /PRNewswire/ — Hospital for Special Surgery (HSS), the top-ranked orthopedic hospital in the nation, today announced the appointments of Harvinder S. Sandhu, MD, MBA, and Andrew A. Sama, MD, as the new co-chiefs of its spine service, effective October 2019. Andrew A. Sama, MD, and Harvinder S. Sandhu, MD, MBA, Named New Co-Chiefs of HSS Spine …