LONDON/MILAN (Reuters) - Goldman Sachs, JPMorgan, Citigroup Inc, Credit Suisse and other banks have curbed trips to Italy amid fears that the coronavirus outbreak across the north of the country could quickly spread across Europe, sources said. Lazard, BNP Paribas and Deutsche Bank also rushed to warn staff against all "non-essential travel" to northern Italy, four sources told Reuters, speaking on condition of anonymity as banking policies are confidential.