 NEW YORK, Nov. 4, 2020 PRNewswire -- AMAG Pharmaceuticals, Inc. NASDAQ:AMAG Lifshitz Law Firm, P.C. announces investigation into possible breach of fiduciary duties in connection with the sale of AMAG to Covis Group S.à r.l. for 13.75 per share. If you are a AMAG investor, and would... 