This author has not been identified. Look up 'Wei Xu' in GoogleThis author has not been identified. Look up 'Zhijun Fu' in GoogleThis author has not been identified. Look up 'Wei-Dong Xie' in GoogleThis author has not been identified. Look up 'An-Qing He' in GoogleThis author has not been identified. Look up 'Yong Xiao' in GoogleThis author has not been identified. Look up 'Bin Li' in Google