BELGRADE, MT, Feb. 12, 2019 (GLOBE NEWSWIRE) — Xtant Medical Holdings, Inc. (NYSE American: XTNT), a global medical technology company focused on surgical solutions for the treatment of spinal disorders, announced today the recent additions of five senior sales executives: Dana Lyons, Vice President of US Sales, Jamey Rottman, Regional Vice President, Mid Atlantic, Chris Cochran, …