By 26 June 2017, the ESAs shall issue guidelines, addressed to competent authorities and to the credit institutions and financial institutions, in accordance with Article 16 of Regulation (EU) No 1093/2010 on the risk factors to be taken into consideration and the measures to be taken in situations where simplified customer due diligence measures are appropriate. From 1 January 2020, EBA shall, where appropriate, issue such guidelines. Specific account shall be taken of the nature and size of the business, and, where appropriate and proportionate, specific measures shall be laid down.