The National Information Security Engineering Center, a building commissioned by the People's Liberation Army's Cyber Unit, is seen at the Zhangjiang High Technology Park, on the outskirts of ShanghaiBy Michael Martina BEIJING (Reuters) – 1 / 4 of corporations which are participants of a number one U.S. trade lobby in China were victims of information theft, a document with the aid of the team stated on Friday, amid growing vitriol between Beijing and Washington over the threat of cyber assaults. Twenty-six percent of members who replied to an annual survey stated their proprietary knowledge or alternate secrets had been compromised or stolen from their China operations, the American Chamber of Commerce in China document said. …