AtriCure (NASDAQ:ATRC) is one of the most promising mid-cap healthcare stocks under 50.OnDecember16,J.P.MorgananalystLilia−Celine(Lily)reiteratedherbullishstanceonAtriCure(NASDAQ:ATRC).TheanalystassignedaBuyratingandraisedherpricetargetonthestockfrom42 to $48 per share. According to Lily’s estimates, the stock offers an upside potential of over 17% for investors. gpointstudio/Shutterstock.com AtriCure (NASDAQ:ATRC) recently announced the successful completion of its fir ...