Commission Regulation (EU) No 1356/2013 of 17 December 2013 initiating an investigation concerning the possible circumvention of anti-dumping measures imposed by Council Implementing Regulation (EU) No 791/2011 on imports of certain open mesh fabrics of glass fibres originating in the People’s Republic of China by imports of certain slightly modified open mesh fabrics of glass fibres originating in the People’s Republic of China, and making such imports subject to registration