This author has not been identified. Look up 'Yang Yu' in GoogleThis author has not been identified. Look up 'Jia Wang' in GoogleThis author has not been identified. Look up 'Wen-Wen Yang' in GoogleThis author has not been identified. Look up 'Jing Xia' in GoogleThis author has not been identified. Look up 'Wei Qin' in GoogleThis author has not been identified. Look up 'Jian-Xin Chen' in Google