ROME (Reuters) - The head of UniCredit confirmed on Wednesday the Bank of Italy was conducting an audit of the loan book of Italy's biggest bank by assets, after sources told Reuters the regulator was examining the loans of Italy's top two lenders. "(This is) routine," UniCredit Chief Executive Federico Ghizzoni told reporters in answer to a question on a loan review being conducted by the central bank. He did not give other details as he was leaving a meeting of the Italian banking association' steering committee. ...