NEW YORK/WASHINGTON (Reuters) – U.S. health insurer Anthem Inc (ANTM.N) on Monday dismissed concerns that buying smaller competitor Cigna Corp (CI.N) would be considered anti-competitive, even as antitrust experts said the combination would earn regulatory scrutiny. Any merger could require asset sales and would be complicated by potential deals among other insurers, which after years of change due to President Barack Obama’s healthcare reform are now scrambling to tie up.